diff --git a/wwwroot/app.js b/wwwroot/app.js
index 18e54d2..683ee04 100644
--- a/wwwroot/app.js
+++ b/wwwroot/app.js
@@ -1,4 +1,7 @@
 import { api, adminApi } from "./js/api.js";
+import { t, setLanguage, getLanguage, initI18n, onLanguageChange } from "./js/i18n.js";
+
+initI18n();
 
 const state = {
   isAuthenticated: false,
@@ -76,7 +79,7 @@ function handleAuthError(err) {
     setAuthUI(false);
     return true;
   }
-  toast(err?.message || "Unexpected error", true);
+  toast(err?.message || t("toast.unexpected"), true);
   return false;
 }
 
@@ -128,7 +131,8 @@ async function loadResults() {
 }
 
 function renderPhasePill() {
-  $("phase-pill").textContent = state.phase || "Loading…";
+  const phaseKey = typeof state.phase === "string" ? state.phase.toLowerCase() : null;
+  $("phase-pill").textContent = phaseKey ? t(`phase.${phaseKey}`) : t("phase.loading");
   document.querySelectorAll(".phase-view").forEach((el) => el.classList.add("hidden"));
   const viewMap = {
     Suggest: "suggest-view",
@@ -146,14 +150,18 @@ function renderPhasePill() {
 
 function renderCounts() {
   if (!state.counts) return;
-  $("counts").textContent = `Players: ${state.counts.players} • Suggestions: ${state.counts.suggestions} • Votes: ${state.counts.votes}`;
+  $("counts").textContent = t("counts.format", {
+    players: state.counts.players,
+    suggestions: state.counts.suggestions,
+    votes: state.counts.votes
+  });
 }
 
 function renderWelcome() {
   const el = $("welcome-text");
   if (!el) return;
-  const name = state.me?.displayName?.trim() || state.me?.username || "Player";
-  el.textContent = `Welcome, ${name}!`;
+  const name = state.me?.displayName?.trim() || state.me?.username || t("auth.defaultName");
+  el.textContent = t("auth.welcome", { name });
 }
 
 function renderMySuggestions() {
@@ -202,7 +210,7 @@ function renderVotes() {
       const score = Number(e.target.value);
       try {
         await api.vote(suggestionId, score);
-        toast("Saved vote");
+        toast(t("vote.saved"));
         await loadVoteData();
       } catch (err) {
         toast(err.message, true);
@@ -233,13 +241,13 @@ function renderResults() {
   table.innerHTML = `
     <thead>
       <tr>
-        <th>Rank</th>
-        <th>Game</th>
-        <th>Author</th>
-        <th>Votes</th>
-        <th>Avg</th>
-        <th>Total</th>
-        <th>Links</th>
+        <th>${t("results.rank")}</th>
+        <th>${t("results.game")}</th>
+        <th>${t("results.author")}</th>
+        <th>${t("results.votes")}</th>
+        <th>${t("results.avg")}</th>
+        <th>${t("results.total")}</th>
+        <th>${t("results.links")}</th>
       </tr>
     </thead>
     <tbody></tbody>
@@ -261,8 +269,8 @@ function renderResults() {
       <td>${r.average.toFixed(1)}</td>
       <td>${r.total}</td>
       <td>
-        ${r.gameUrl ? `<a class="link compact" href="${r.gameUrl}" target="_blank" rel="noopener">Site ↗</a><br>` : ''}
-        ${r.youtubeUrl ? `<a class="link compact" href="${r.youtubeUrl}" target="_blank" rel="noopener">YouTube ↗</a>` : ''}
+        ${r.gameUrl ? `<a class="link compact" href="${r.gameUrl}" target="_blank" rel="noopener">${t("results.link.site")}</a><br>` : ''}
+        ${r.youtubeUrl ? `<a class="link compact" href="${r.youtubeUrl}" target="_blank" rel="noopener">${t("results.link.youtube")}</a>` : ''}
       </td>
     `;
     tbody.appendChild(row);
@@ -279,22 +287,45 @@ function setupHandlers() {
   });
   setAuthMode(state.authMode);
 
+  const langSelect = $("language-select");
+  if (langSelect) {
+    langSelect.value = getLanguage();
+    langSelect.addEventListener("change", () => setLanguage(langSelect.value));
+  }
+
+  onLanguageChange(() => {
+    if (langSelect) langSelect.value = getLanguage();
+    renderWelcome();
+    renderPhasePill();
+    renderCounts();
+    renderMySuggestions();
+    renderAllSuggestions();
+    if (state.phase === "Vote") {
+      renderVotes();
+      state.votesRendered = true;
+      syncVoteScores();
+    }
+    if (state.phase === "Results") {
+      renderResults();
+    }
+  });
+
   const loginForm = $("login-form");
   if (loginForm) {
     loginForm.addEventListener("submit", async (e) => {
       e.preventDefault();
       const username = $("login-username").value.trim();
       const password = $("login-password").value;
-      if (!username || !password) return toast("Username and password required", true);
+      if (!username || !password) return toast(t("auth.needCredentials"), true);
       try {
         await api.login({ username, password });
         setSavedUsername(username);
         state.isAuthenticated = true;
         setAuthUI(true);
         await refreshPhaseData();
-        toast("Logged in");
+        toast(t("toast.loggedIn"));
       } catch (err) {
-        if (err?.status === 401) return toast("Invalid username or password", true);
+        if (err?.status === 401) return toast(t("auth.invalidCredentials"), true);
         if (handleAuthError(err)) return;
       }
     });
@@ -308,14 +339,14 @@ function setupHandlers() {
       const password = $("register-password").value;
       const displayName = $("register-displayName").value.trim();
       const adminKey = $("register-adminkey").value.trim();
-      if (!username || !password) return toast("Username and password required", true);
+      if (!username || !password) return toast(t("auth.needCredentials"), true);
       try {
         await api.register({ username, password, displayName, adminKey });
         setSavedUsername(username);
         state.isAuthenticated = true;
         setAuthUI(true);
         await refreshPhaseData();
-        toast("Registered");
+        toast(t("toast.registered"));
       } catch (err) {
         if (handleAuthError(err)) return;
         toast(err.message, true);
@@ -327,14 +358,14 @@ function setupHandlers() {
     e.preventDefault();
     const form = e.target;
     const data = normalizeSuggestionForm(new FormData(form));
-    if (!data.name) return toast("Name required", true);
+    if (!data.name) return toast(t("toast.nameRequired"), true);
     if (data.screenshotUrl && !isValidImageUrl(data.screenshotUrl)) {
-      return toast("Screenshot URL must be http(s) and end with an image file.", true);
+      return toast(t("toast.invalidImageUrl"), true);
     }
     try {
       await api.createSuggestion(data);
       form.reset();
-      toast("Suggestion added");
+      toast(t("toast.suggestionAdded"));
       await loadSuggestData();
     } catch (err) {
       toast(err.message, true);
@@ -345,7 +376,7 @@ function setupHandlers() {
     const phase = $("phase-select").value;
     try {
       await adminApi.setPhase(phase);
-      toast("Phase updated");
+      toast(t("admin.phaseUpdated"));
       state.prevPhase = state.phase;
       state.phase = phase;
       state.votesRendered = false;
@@ -363,8 +394,8 @@ function setupHandlers() {
   });
   phaseSelect.addEventListener("blur", () => { phaseSelect.dataset.userEditing = ""; });
 
-  $("reset").addEventListener("click", () => adminAction(adminApi.reset, "Reset complete"));
-  $("factory-reset").addEventListener("click", () => adminAction(adminApi.factoryReset, "Factory reset complete"));
+  $("reset").addEventListener("click", () => adminAction(adminApi.reset, t("admin.resetDone")));
+  $("factory-reset").addEventListener("click", () => adminAction(adminApi.factoryReset, t("admin.factoryResetDone")));
 
   const logoutBtn = $("logout");
   if (logoutBtn) {
@@ -432,7 +463,7 @@ function buildCard(s, { showAuthor = false, allowDelete = false, allowEdit = fal
   card.className = "game-card";
   const hasImage = !!s.screenshotUrl;
   const visual = hasImage
-    ? `<button class="card-visual" data-img="${s.screenshotUrl}" aria-label="Open screenshot" style="background-image:url('${s.screenshotUrl}')"></button>`
+    ? `<button class="card-visual" data-img="${s.screenshotUrl}" aria-label="${t("card.openScreenshot")}" style="background-image:url('${s.screenshotUrl}')"></button>`
     : `<div class="card-visual"></div>`;
   card.innerHTML = `
     ${visual}
@@ -440,16 +471,16 @@ function buildCard(s, { showAuthor = false, allowDelete = false, allowEdit = fal
       <div class="card-title-row">
         <h3>${s.name}</h3>
         <div class="title-meta">
-          ${s.gameUrl ? `<a class="link compact" href="${s.gameUrl}" target="_blank" rel="noopener">Site ↗</a>` : ""}
-          ${s.youtubeUrl ? `<a class="link compact" href="${s.youtubeUrl}" target="_blank" rel="noopener">YouTube ↗</a>` : ""}
+          ${s.gameUrl ? `<a class="link compact" href="${s.gameUrl}" target="_blank" rel="noopener">${t("card.site")}</a>` : ""}
+          ${s.youtubeUrl ? `<a class="link compact" href="${s.youtubeUrl}" target="_blank" rel="noopener">${t("card.youtube")}</a>` : ""}
           ${showAuthor && s.author ? `<span class="chip">${s.author}</span>` : ""}
-          ${allowEdit ? `<button class="chip" data-edit="${s.id}" type="button">Edit</button>` : ""}
-          ${allowDelete ? `<button class="chip danger-chip" data-delete="${s.id}" type="button">Delete</button>` : ""}
+          ${allowEdit ? `<button class="chip" data-edit="${s.id}" type="button">${t("card.edit")}</button>` : ""}
+          ${allowDelete ? `<button class="chip danger-chip" data-delete="${s.id}" type="button">${t("card.delete")}</button>` : ""}
         </div>
       </div>
       ${s.genre ? `<p class="muted">${s.genre}</p>` : ""}
       ${s.description ? `<p>${s.description}</p>` : ""}
-      ${(s.minPlayers || s.maxPlayers) ? `<p class="muted">Players: ${s.minPlayers ?? "?"}–${s.maxPlayers ?? "?"}</p>` : ""}
+      ${(s.minPlayers || s.maxPlayers) ? `<p class="muted">${t("card.players", { min: s.minPlayers ?? "?", max: s.maxPlayers ?? "?" })}</p>` : ""}
     </div>
   `;
   if (hasImage) {
@@ -465,7 +496,7 @@ function buildCard(s, { showAuthor = false, allowDelete = false, allowEdit = fal
     del.addEventListener("click", async () => {
       try {
         await api.deleteSuggestion(s.id);
-        toast("Suggestion deleted");
+        toast(t("toast.suggestionDeleted"));
         await loadSuggestData();
       } catch (err) {
         toast(err.message, true);
@@ -481,35 +512,35 @@ function openEditModal(s) {
   overlay.innerHTML = `
     <div class="edit-panel">
       <div class="edit-header">
-        <h3>Edit game</h3>
-        <button class="lightbox-close" aria-label="Close">×</button>
+        <h3>${t("modal.editTitle")}</h3>
+        <button class="lightbox-close" aria-label="${t("modal.close")}">×</button>
       </div>
       <div class="edit-body">
         <form class="stack" id="edit-form">
-          <input name="name" required maxlength="100" placeholder="Game name *" value="${s.name ?? ""}" />
-          <input name="genre" maxlength="50" placeholder="Genre" value="${s.genre ?? ""}" />
-          <textarea name="description" maxlength="500" placeholder="Short description">${s.description ?? ""}</textarea>
+          <input name="name" required maxlength="100" placeholder="${t("form.placeholder.gameName")}" value="${s.name ?? ""}" />
+          <input name="genre" maxlength="50" placeholder="${t("form.placeholder.genre")}" value="${s.genre ?? ""}" />
+          <textarea name="description" maxlength="500" placeholder="${t("form.placeholder.description")}">${s.description ?? ""}</textarea>
           <div class="stack">
-            <span class="label">Players</span>
+            <span class="label">${t("form.players")}</span>
             <div class="stack horizontal">
               <label class="stack">
-                <span class="label">Min</span>
+                <span class="label">${t("form.min")}</span>
                 <input name="minPlayers" type="number" min="1" max="32" inputmode="numeric" value="${s.minPlayers ?? ""}" />
               </label>
               <label class="stack">
-                <span class="label">Max</span>
+                <span class="label">${t("form.max")}</span>
                 <input name="maxPlayers" type="number" min="1" max="32" inputmode="numeric" value="${s.maxPlayers ?? ""}" />
               </label>
             </div>
           </div>
           <div class="stack horizontal">
-            <input name="screenshotUrl" maxlength="2048" placeholder="Screenshot URL" value="${s.screenshotUrl ?? ""}" />
-            <input name="youtubeUrl" maxlength="2048" placeholder="YouTube URL" value="${s.youtubeUrl ?? ""}" />
-            <input name="gameUrl" maxlength="2048" placeholder="Game website URL" value="${s.gameUrl ?? ""}" />
+            <input name="screenshotUrl" maxlength="2048" placeholder="${t("form.placeholder.screenshot")}" value="${s.screenshotUrl ?? ""}" />
+            <input name="youtubeUrl" maxlength="2048" placeholder="${t("form.placeholder.youtube")}" value="${s.youtubeUrl ?? ""}" />
+            <input name="gameUrl" maxlength="2048" placeholder="${t("form.placeholder.gameUrl")}" value="${s.gameUrl ?? ""}" />
           </div>
           <div class="stack horizontal">
-            <button type="submit">Save changes</button>
-            <button type="button" class="ghost" id="edit-cancel">Cancel</button>
+            <button type="submit">${t("modal.save")}</button>
+            <button type="button" class="ghost" id="edit-cancel">${t("modal.cancel")}</button>
           </div>
         </form>
       </div>
@@ -529,12 +560,12 @@ function openEditModal(s) {
     e.preventDefault();
     const data = normalizeSuggestionForm(new FormData(form));
     if (data.screenshotUrl && !isValidImageUrl(data.screenshotUrl)) {
-      return toast("Screenshot URL must be http(s) and end with an image file.", true);
+      return toast(t("toast.invalidImageUrl"), true);
     }
-    if (!data.name?.trim()) return toast("Name required", true);
+    if (!data.name?.trim()) return toast(t("toast.nameRequired"), true);
     try {
       await api.updateSuggestion(s.id, data);
-      toast("Saved changes");
+      toast(t("toast.savedChanges"));
       close();
       await refreshPhaseData();
     } catch (err) {
@@ -551,7 +582,7 @@ function openLightbox(url, title) {
   overlay.className = "lightbox";
   overlay.innerHTML = `
     <div class="lightbox-content">
-      <button class="lightbox-close" aria-label="Close">✕</button>
+      <button class="lightbox-close" aria-label="${t("lightbox.close")}">✕</button>
       <img src="${url}" alt="${title}" />
       <p>${title || ""}</p>
     </div>
diff --git a/wwwroot/index.html b/wwwroot/index.html
index cc6d04a..9f790c0 100644
--- a/wwwroot/index.html
+++ b/wwwroot/index.html
@@ -9,52 +9,59 @@
   <meta name="app-base" content="">
 </head>
 <body class="page">
+  <div class="lang-switch">
+    <label for="language-select" data-i18n="lang.label">Language</label>
+    <select id="language-select">
+      <option value="en" data-i18n="lang.en">English</option>
+      <option value="de" data-i18n="lang.de">Deutsch</option>
+    </select>
+  </div>
   <section class="card hidden" id="auth-card">
     <div class="stack horizontal">
-      <button class="ghost active" data-auth-tab="login" type="button">Log in</button>
-      <button class="ghost" data-auth-tab="register" type="button">Register</button>
+      <button class="ghost active" data-auth-tab="login" type="button" data-i18n="auth.loginTab">Log in</button>
+      <button class="ghost" data-auth-tab="register" type="button" data-i18n="auth.registerTab">Register</button>
     </div>
     <form id="login-form" class="stack auth-form" data-mode="login">
       <label class="stack">
-        <span class="label">Username</span>
+        <span class="label" data-i18n="auth.username">Username</span>
         <input id="login-username" name="username" maxlength="64" autocomplete="username" required />
       </label>
       <label class="stack">
-        <span class="label">Password</span>
+        <span class="label" data-i18n="auth.password">Password</span>
         <input id="login-password" name="password" type="password" autocomplete="current-password" required />
       </label>
-      <button type="submit">Log in</button>
+      <button type="submit" data-i18n="auth.loginSubmit">Log in</button>
     </form>
     <form id="register-form" class="stack auth-form hidden" data-mode="register">
       <label class="stack">
-        <span class="label">Username</span>
+        <span class="label" data-i18n="auth.username">Username</span>
         <input id="register-username" name="username" maxlength="64" autocomplete="username" required />
       </label>
       <label class="stack">
-        <span class="label">Password</span>
+        <span class="label" data-i18n="auth.password">Password</span>
         <input id="register-password" name="password" type="password" autocomplete="new-password" required />
       </label>
       <label class="stack">
-        <span class="label">Display name (shows to group)</span>
+        <span class="label" data-i18n="auth.displayName">Display name (shows to group)</span>
         <input id="register-displayName" name="displayName" maxlength="64" required />
       </label>
       <label class="stack">
-        <span class="label">Admin key (optional)</span>
+        <span class="label" data-i18n="auth.adminKey">Admin key (optional)</span>
         <input id="register-adminkey" name="adminKey" type="password" maxlength="128" />
       </label>
-      <button type="submit">Create account</button>
+      <button type="submit" data-i18n="auth.registerSubmit">Create account</button>
     </form>
   </section>
 
   <section>
   <div class="status-bar">
     <div class="status-left">
-      <span id="welcome-text">Welcome!</span>
-      <a id="logout" href="#" class="link inline-link">Logout</a>
+      <span id="welcome-text" data-i18n="auth.welcome">Welcome!</span>
+      <a id="logout" href="#" class="link inline-link" data-i18n="auth.logout">Logout</a>
     </div>
     <div class="status-right">
         <span class="status-dot"></span>
-        <span id="phase-pill">Loading…</span>
+        <span id="phase-pill" data-i18n="phase.loading">Loading…</span>
         <span class="counts" id="counts">—</span>
       </div>
     </div>
@@ -64,90 +71,90 @@
     <section id="actions-card">
       <div id="suggest-view" class="phase-view hidden">
         <div class="card">
-          <h2>Suggest (up to 5)</h2>
-          <p class="hint">Only you can see your suggestions until Reveal.</p>
+          <h2 data-i18n="suggest.title">Suggest (up to 5)</h2>
+          <p class="hint" data-i18n="suggest.hint">Only you can see your suggestions until Reveal.</p>
           <form id="suggest-form" class="stack">
             <label class="stack">
-              <span class="label">Game name *</span>
+              <span class="label" data-i18n="form.gameName">Game name *</span>
               <input name="name" required maxlength="100" />
             </label>
             <label class="stack">
-              <span class="label">Genre</span>
+              <span class="label" data-i18n="form.genre">Genre</span>
               <input name="genre" maxlength="50" />
             </label>
             <label class="stack">
-              <span class="label">Description</span>
+              <span class="label" data-i18n="form.description">Description</span>
               <textarea name="description" maxlength="500"></textarea>
             </label>
             <div class="stack">
-              <span class="label">Players</span>
+              <span class="label" data-i18n="form.players">Players</span>
               <div class="stack horizontal">
                 <label class="stack">
-                  <span class="label">Min</span>
+                  <span class="label" data-i18n="form.min">Min</span>
                   <input name="minPlayers" type="number" min="1" max="32" inputmode="numeric" />
                 </label>
                 <label class="stack">
-                  <span class="label">Max</span>
+                  <span class="label" data-i18n="form.max">Max</span>
                   <input name="maxPlayers" type="number" min="1" max="32" inputmode="numeric" />
                 </label>
               </div>
             </div>
             <label class="stack">
-              <span class="label">Screenshot URL</span>
+              <span class="label" data-i18n="form.screenshot">Screenshot URL</span>
               <input name="screenshotUrl" maxlength="2048" />
             </label>
             <label class="stack">
-              <span class="label">YouTube URL</span>
+              <span class="label" data-i18n="form.youtube">YouTube URL</span>
               <input name="youtubeUrl" maxlength="2048" />
             </label>
             <label class="stack">
-              <span class="label">Game website URL</span>
+              <span class="label" data-i18n="form.gameUrl">Game website URL</span>
               <input name="gameUrl" maxlength="2048" />
             </label>
-            <button type="submit">Submit</button>
+            <button type="submit" data-i18n="form.submit">Submit</button>
           </form>
         </div>
         <div class="card subcard">
-          <h3>Your suggestions</h3>
+          <h3 data-i18n="section.mySuggestions">Your suggestions</h3>
           <div id="my-suggestions" class="card-grid"></div>
         </div>
       </div>
 
       <div id="reveal-view" class="phase-view hidden">
-        <h2>All Suggestions</h2>
+        <h2 data-i18n="section.allSuggestions">All Suggestions</h2>
         <div id="all-suggestions" class="card-grid"></div>
       </div>
 
       <div id="vote-view" class="phase-view hidden">
-        <h2>Vote 0–10</h2>
+        <h2 data-i18n="section.vote">Vote 0–10</h2>
         <div id="vote-list" class="card-grid"></div>
       </div>
 
       <div id="results-view" class="phase-view hidden">
-        <h2>Results</h2>
+        <h2 data-i18n="section.results">Results</h2>
         <div id="results-list" class="card-grid results-grid"></div>
       </div>
     </section>
   </main>
 
-  <button id="admin-toggle" class="admin-toggle" title="Admin tools">•••</button>
+  <button id="admin-toggle" class="admin-toggle" title="Admin tools" data-i18n="admin.tools" data-i18n-attr="title">•••</button>
   <section class="card admin-panel hidden" id="admin-card">
     <div class="panel-header">
-      <h3>Admin</h3>
+      <h3 data-i18n="admin.title">Admin</h3>
       <button id="admin-close" class="ghost">✕</button>
     </div>
     <div class="stack horizontal">
       <select id="phase-select">
-        <option>Suggest</option>
-        <option>Reveal</option>
-        <option>Vote</option>
-        <option>Results</option>
+        <option value="Suggest" data-i18n="phase.suggest">Suggest</option>
+        <option value="Reveal" data-i18n="phase.reveal">Reveal</option>
+        <option value="Vote" data-i18n="phase.vote">Vote</option>
+        <option value="Results" data-i18n="phase.results">Results</option>
       </select>
-      <button id="set-phase">Set phase</button>
+      <button id="set-phase" data-i18n="admin.setPhase">Set phase</button>
     </div>
     <div class="stack horizontal">
-      <button id="reset" class="danger">Reset (keep players)</button>
-      <button id="factory-reset" class="danger">Factory reset</button>
+      <button id="reset" class="danger" data-i18n="admin.reset">Reset (keep players)</button>
+      <button id="factory-reset" class="danger" data-i18n="admin.factoryReset">Factory reset</button>
     </div>
   </section>
 
diff --git a/wwwroot/js/i18n.js b/wwwroot/js/i18n.js
new file mode 100644
index 0000000..82d8ca6
--- /dev/null
+++ b/wwwroot/js/i18n.js
@@ -0,0 +1,264 @@
+const translations = {
+  en: {
+    "lang.label": "Language",
+    "lang.en": "English",
+    "lang.de": "Deutsch",
+
+    "auth.loginTab": "Log in",
+    "auth.registerTab": "Register",
+    "auth.username": "Username",
+    "auth.password": "Password",
+    "auth.displayName": "Display name (shows to group)",
+    "auth.adminKey": "Admin key (optional)",
+    "auth.loginSubmit": "Log in",
+    "auth.registerSubmit": "Create account",
+    "auth.logout": "Logout",
+    "auth.welcome": "Welcome, {name}!",
+    "auth.defaultName": "Player",
+    "auth.loading": "Loading…",
+    "auth.needCredentials": "Username and password required",
+    "auth.invalidCredentials": "Invalid username or password",
+
+    "phase.suggest": "Suggest",
+    "phase.reveal": "Reveal",
+    "phase.vote": "Vote",
+    "phase.results": "Results",
+    "phase.loading": "Loading…",
+
+    "counts.format": "Players: {players} • Suggestions: {suggestions} • Votes: {votes}",
+
+    "suggest.title": "Suggest (up to 5)",
+    "suggest.hint": "Only you can see your suggestions until Reveal.",
+    "form.gameName": "Game name *",
+    "form.genre": "Genre",
+    "form.description": "Description",
+    "form.players": "Players",
+    "form.min": "Min",
+    "form.max": "Max",
+    "form.screenshot": "Screenshot URL",
+    "form.youtube": "YouTube URL",
+    "form.gameUrl": "Game website URL",
+    "form.submit": "Submit",
+    "form.placeholder.description": "Short description",
+    "form.placeholder.gameName": "Game name *",
+    "form.placeholder.genre": "Genre",
+    "form.placeholder.screenshot": "Screenshot URL",
+    "form.placeholder.youtube": "YouTube URL",
+    "form.placeholder.gameUrl": "Game website URL",
+
+    "section.mySuggestions": "Your suggestions",
+    "section.allSuggestions": "All Suggestions",
+    "section.vote": "Vote 0-10",
+    "section.results": "Results",
+
+    "card.edit": "Edit",
+    "card.delete": "Delete",
+    "card.players": "Players: {min}–{max}",
+    "card.site": "Site ↗",
+    "card.youtube": "YouTube ↗",
+    "card.openScreenshot": "Open screenshot",
+
+    "vote.saved": "Saved vote",
+
+    "results.rank": "Rank",
+    "results.game": "Game",
+    "results.author": "Author",
+    "results.votes": "Votes",
+    "results.avg": "Avg",
+    "results.total": "Total",
+    "results.links": "Links",
+    "results.link.site": "Site ↗",
+    "results.link.youtube": "YouTube ↗",
+
+    "admin.title": "Admin",
+    "admin.tools": "Admin tools",
+    "admin.setPhase": "Set phase",
+    "admin.reset": "Reset (keep players)",
+    "admin.factoryReset": "Factory reset",
+    "admin.phaseUpdated": "Phase updated",
+    "admin.resetDone": "Reset complete",
+    "admin.factoryResetDone": "Factory reset complete",
+
+    "toast.unexpected": "Unexpected error",
+    "toast.registered": "Registered",
+    "toast.loggedIn": "Logged in",
+    "toast.suggestionAdded": "Suggestion added",
+    "toast.suggestionDeleted": "Suggestion deleted",
+    "toast.savedChanges": "Saved changes",
+    "toast.nameRequired": "Name required",
+    "toast.invalidImageUrl": "Screenshot URL must be http(s) and end with an image file.",
+
+    "modal.editTitle": "Edit game",
+    "modal.save": "Save changes",
+    "modal.cancel": "Cancel",
+    "modal.close": "Close",
+
+    "lightbox.close": "Close",
+  },
+  de: {
+    "lang.label": "Sprache",
+    "lang.en": "Englisch",
+    "lang.de": "Deutsch",
+
+    "auth.loginTab": "Anmelden",
+    "auth.registerTab": "Registrieren",
+    "auth.username": "Benutzername",
+    "auth.password": "Passwort",
+    "auth.displayName": "Anzeigename (für die Gruppe sichtbar)",
+    "auth.adminKey": "Admin-Schlüssel (optional)",
+    "auth.loginSubmit": "Anmelden",
+    "auth.registerSubmit": "Konto erstellen",
+    "auth.logout": "Abmelden",
+    "auth.welcome": "Willkommen, {name}!",
+    "auth.defaultName": "Spieler",
+    "auth.loading": "Lädt…",
+    "auth.needCredentials": "Benutzername und Passwort erforderlich",
+    "auth.invalidCredentials": "Ungültiger Benutzername oder Passwort",
+
+    "phase.suggest": "Vorschlagen",
+    "phase.reveal": "Enthüllen",
+    "phase.vote": "Bewerten",
+    "phase.results": "Ergebnisse",
+    "phase.loading": "Lädt…",
+
+    "counts.format": "Spieler: {players} • Vorschläge: {suggestions} • Stimmen: {votes}",
+
+    "suggest.title": "Vorschlagen (bis zu 5)",
+    "suggest.hint": "Nur du siehst deine Vorschläge bis zur Enthüllung.",
+    "form.gameName": "Spielname *",
+    "form.genre": "Genre",
+    "form.description": "Beschreibung",
+    "form.players": "Spieler",
+    "form.min": "Min",
+    "form.max": "Max",
+    "form.screenshot": "Screenshot-URL",
+    "form.youtube": "YouTube-URL",
+    "form.gameUrl": "Spiel-Webseite",
+    "form.submit": "Absenden",
+    "form.placeholder.description": "Kurze Beschreibung",
+    "form.placeholder.gameName": "Spielname *",
+    "form.placeholder.genre": "Genre",
+    "form.placeholder.screenshot": "Screenshot-URL",
+    "form.placeholder.youtube": "YouTube-URL",
+    "form.placeholder.gameUrl": "Spiel-Webseite",
+
+    "section.mySuggestions": "Deine Vorschläge",
+    "section.allSuggestions": "Alle Vorschläge",
+    "section.vote": "Bewerten 0-10",
+    "section.results": "Ergebnisse",
+
+    "card.edit": "Bearbeiten",
+    "card.delete": "Löschen",
+    "card.players": "Spieler: {min}–{max}",
+    "card.site": "Website ↗",
+    "card.youtube": "YouTube ↗",
+    "card.openScreenshot": "Screenshot öffnen",
+
+    "vote.saved": "Stimme gespeichert",
+
+    "results.rank": "Rang",
+    "results.game": "Spiel",
+    "results.author": "Autor",
+    "results.votes": "Stimmen",
+    "results.avg": "Durchschn.",
+    "results.total": "Gesamt",
+    "results.links": "Links",
+    "results.link.site": "Website ↗",
+    "results.link.youtube": "YouTube ↗",
+
+    "admin.title": "Admin",
+    "admin.tools": "Admin-Werkzeuge",
+    "admin.setPhase": "Phase setzen",
+    "admin.reset": "Zurücksetzen (Spieler behalten)",
+    "admin.factoryReset": "Werkseinstellung",
+    "admin.phaseUpdated": "Phase aktualisiert",
+    "admin.resetDone": "Zurücksetzen abgeschlossen",
+    "admin.factoryResetDone": "Werkseinstellung abgeschlossen",
+
+    "toast.unexpected": "Unerwarteter Fehler",
+    "toast.registered": "Registriert",
+    "toast.loggedIn": "Angemeldet",
+    "toast.suggestionAdded": "Vorschlag hinzugefügt",
+    "toast.suggestionDeleted": "Vorschlag gelöscht",
+    "toast.savedChanges": "Änderungen gespeichert",
+    "toast.nameRequired": "Name erforderlich",
+    "toast.invalidImageUrl": "Screenshot-URL muss mit http(s) beginnen und auf eine Bilddatei enden.",
+
+    "modal.editTitle": "Spiel bearbeiten",
+    "modal.save": "Änderungen speichern",
+    "modal.cancel": "Abbrechen",
+    "modal.close": "Schließen",
+
+    "lightbox.close": "Schließen",
+  }
+};
+
+const storageKey = "app_lang";
+const defaultLang = "en";
+let currentLang = defaultLang;
+const listeners = [];
+
+function interpolate(template, params = {}) {
+  return template.replace(/\{(\w+)\}/g, (_, key) => (params[key] ?? `{${key}}`));
+}
+
+function t(key, params) {
+  const fallback = translations[defaultLang][key] ?? key;
+  const phrase = translations[currentLang]?.[key] ?? fallback;
+  return interpolate(phrase, params);
+}
+
+function detectLanguage() {
+  const stored = localStorage.getItem(storageKey);
+  if (stored && translations[stored]) return stored;
+  const nav = navigator.language?.slice(0, 2);
+  if (nav && translations[nav]) return nav;
+  return defaultLang;
+}
+
+function applyTranslations(root = document) {
+  root.querySelectorAll("[data-i18n]").forEach((el) => {
+    const key = el.dataset.i18n;
+    const attrs = (el.dataset.i18nAttr || "")
+      .split(",")
+      .map((a) => a.trim())
+      .filter(Boolean);
+    const text = t(key);
+    if (attrs.length === 0) {
+      el.textContent = text;
+    } else {
+      attrs.forEach((attr) => el.setAttribute(attr, text));
+    }
+  });
+}
+
+function notify() {
+  listeners.forEach((fn) => fn(currentLang));
+}
+
+function setLanguage(lang) {
+  if (!translations[lang]) lang = defaultLang;
+  currentLang = lang;
+  localStorage.setItem(storageKey, lang);
+  document.documentElement.lang = lang;
+  applyTranslations();
+  notify();
+}
+
+function getLanguage() {
+  return currentLang;
+}
+
+function initI18n() {
+  currentLang = detectLanguage();
+  document.documentElement.lang = currentLang;
+  applyTranslations();
+  notify();
+  return currentLang;
+}
+
+function onLanguageChange(fn) {
+  listeners.push(fn);
+}
+
+export { t, setLanguage, getLanguage, initI18n, applyTranslations, onLanguageChange, translations };
diff --git a/wwwroot/styles.css b/wwwroot/styles.css
index 11d2287..2d93b3a 100644
--- a/wwwroot/styles.css
+++ b/wwwroot/styles.css
@@ -13,6 +13,21 @@
   gap: 16px;
 }
 
+.lang-switch {
+  align-self: flex-end;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  background: rgba(15, 23, 42, 0.8);
+  border: 1px solid #1f2937;
+  border-radius: 10px;
+  padding: 6px 10px;
+  box-shadow: 0 10px 24px rgba(0,0,0,0.25);
+  font-size: 14px;
+}
+.lang-switch label { color: #9ca3af; }
+.lang-switch select { min-width: 120px; }
+
 .status-bar {
   display: flex;
   width: 100%;
@@ -184,9 +199,9 @@ button.ghost {
   border: 1px solid #b91c1c;
 }
 
-.vote-controls { display: flex; gap: 10px; align-items: center; margin-top: auto; padding-top: 8px; }
+.vote-controls { display: flex; gap: 10px; align-items: center; margin-top: auto; padding-top: 6px; }
 .score { font-weight: 700; min-width: 36px; text-align: center; }
-.score-emoji { font-size: 18px; }
+.score-emoji { font-size: 24px; text-align: center; }
 
 .results-grid .game-card { border-color: #2563eb44; }