Replace results-phase checkbox with stateful button

wwwroot/js/votes-ui.js

@@ -270,6 +270,8 @@ export function updatePhaseNav() {
 
     const adminResultsToggle = $("results-open");
     if (adminResultsToggle) {
-        adminResultsToggle.checked = !!state.resultsOpen;
+        adminResultsToggle.textContent = state.resultsOpen
+            ? t("admin.resultsOpenDisable")
+            : t("admin.resultsOpenEnable");
     }
 }