Implement en/fr localization across admin and user UIs

Introduce client-side localization helper and en/fr locale bundles.

Route admin control, picks, movies, stats, winners and settings UIs through i18n keys instead of hardcoded text.

Remove French text from the English UI and standardize shared messages (saving, network errors, confirmations).

Update .gitignore to ignore editor metadata and localization helper artifacts.

public/js/app_view-picks.js

@@ -41,6 +41,27 @@
   let categories = [];
   let currentYear = new Date().getFullYear();
 
+  function t(key, fallback, params) {
+    try {
+      if (window.i18n && typeof window.i18n.t === 'function') {
+        return window.i18n.t(key, params || {});
+      }
+    } catch (_) {}
+    let out = (typeof fallback === 'string') ? fallback : String(key);
+    if (params && typeof params === 'object') {
+      Object.keys(params).forEach((k) => {
+        out = out.replace(new RegExp(`\\{${k}\\}`, 'g'), String(params[k]));
+      });
+    }
+    return out;
+  }
+
+  function getLocale() {
+    return (window.i18n && typeof window.i18n.getLanguage === 'function')
+      ? window.i18n.getLanguage()
+      : (document.documentElement.lang || 'en');
+  }
+
   function showAlert(message, type = 'info') {
     const container = document.getElementById('alert-container');
     if (!container) return;
@@ -91,7 +112,7 @@
       renderPicks();
     } catch (err) {
       console.error('Error fetching picks:', err);
-      showAlert('Erreur lors du chargement des choix: ' + err.message, 'danger');
+      showAlert(t('viewPicks.errorLoading', 'Error loading picks: {error}', { error: err.message }), 'danger');
     }
   }
 
@@ -102,7 +123,7 @@
     if (allPicks.length === 0) {
       container.innerHTML = `
         <div class="alert alert-info">
-          Aucun utilisateur n'a encore soumis ses choix pour l'année ${currentYear}.
+          ${t('viewPicks.noPicks', 'No user has submitted picks for year {year} yet.', { year: currentYear })}
         </div>
       `;
       return;
@@ -115,9 +136,19 @@
     });
     
     container.innerHTML = allPicks.map(pick => {
-      const userName = pick.userId?.name || 'Utilisateur inconnu';
+      const userName = pick.userId?.name || t('viewPicks.unknownUser', 'Unknown user');
       const userEmail = pick.userId?.email || '';
-      const submittedDate = pick.submittedAt ? new Date(pick.submittedAt).toLocaleString('fr-FR') : '—';
+      let submittedDate = '—';
+      if (pick.submittedAt) {
+        const d = new Date(pick.submittedAt);
+        if (!Number.isNaN(d.getTime())) {
+          try {
+            submittedDate = d.toLocaleString(getLocale(), { dateStyle: 'medium', timeStyle: 'short' });
+          } catch (_) {
+            submittedDate = d.toLocaleString();
+          }
+        }
+      }
       
       // Create a map of picks by category
       const picksMap = new Map();
@@ -141,7 +172,7 @@
                 <strong>${cat.categoryNumber}. ${cat.categoryName}</strong><br>
                 <span class="text-muted">${selected}</span>
               </div>
-              ${isWinner ? '<span class="badge bg-success">Gagnant</span>' : ''}
+              ${isWinner ? `<span class="badge bg-success">${t('viewPicks.winnerBadge', 'Winner')}</span>` : ''}
             </div>
           </div>
         `;
@@ -156,13 +187,13 @@
                 <small class="text-muted">${userEmail}</small>
               </div>
               <div class="text-end">
-                <small class="text-muted">Soumis le: ${submittedDate}</small><br>
-                <span class="badge bg-primary">${pick.picks.length} / ${categories.length} catégories</span>
+                <small class="text-muted">${t('viewPicks.submittedOn', 'Submitted on: {date}', { date: submittedDate })}</small><br>
+                <span class="badge bg-primary">${t('viewPicks.categoriesCount', '{count} / {total} categories', { count: pick.picks.length, total: categories.length })}</span>
               </div>
             </div>
           </div>
           <div class="card-body">
-            ${picksList || '<div class="text-muted">Aucun choix enregistré</div>'}
+            ${picksList || `<div class="text-muted">${t('viewPicks.noPicks2', 'No picks recorded')}</div>`}
           </div>
         </div>
       `;
@@ -172,7 +203,7 @@
   // Event listeners
   document.getElementById('refresh-picks')?.addEventListener('click', () => {
     fetchAllPicks();
-    showAlert('Choix rafraîchis', 'info');
+    showAlert(t('viewPicks.picksRefreshed', 'Picks refreshed'), 'info');
   });
 
   // Initial load