diff --git a/public/css/app.css b/public/css/app.css
index 702e5a5..3733ce7 100644
--- a/public/css/app.css
+++ b/public/css/app.css
@@ -400,7 +400,7 @@ footer {
   }
 
 /* Smooth navbar transition while i18n loads
-   - Keep navbar visible but subtly blurred/faded to avoid abrupt disappearance.
+   - Keep navbar visible with a soft fade/slide to avoid abrupt disappearance.
    - Make elements non-interactive until translations are applied. */
 body:not(.i18n-ready) nav.navbar,
 body:not(.i18n-ready) .navbar,
@@ -409,12 +409,25 @@ body:not(.i18n-ready) .navbar .nav-link,
 body:not(.i18n-ready) .navbar .navbar-text,
 body:not(.i18n-ready) .navbar .btn {
   transition: filter 220ms ease, opacity 220ms ease, transform 220ms ease;
-  filter: blur(6px) saturate(0.9) grayscale(0.06);
-  opacity: 0.85;
+  /* Light mode & default: fully fade out navbar until i18n is ready
+     so fallback labels never flash. */
+  opacity: 0;
   transform: translateY(-2px);
   pointer-events: none;
 }
 
+/* Dark mode: keep the original soft blur effect while loading
+   so the navbar stays visible but its text is obscured. */
+html[data-theme="dark"] body:not(.i18n-ready) nav.navbar,
+html[data-theme="dark"] body:not(.i18n-ready) .navbar,
+html[data-theme="dark"] body:not(.i18n-ready) .navbar .navbar-brand,
+html[data-theme="dark"] body:not(.i18n-ready) .navbar .nav-link,
+html[data-theme="dark"] body:not(.i18n-ready) .navbar .navbar-text,
+html[data-theme="dark"] body:not(.i18n-ready) .navbar .btn {
+  filter: blur(6px) saturate(0.9) grayscale(0.06);
+  opacity: 0.85;
+}
+
 /* When translations are ready, restore full clarity and interactivity */
 body.i18n-ready nav.navbar,
 body.i18n-ready .navbar,
diff --git a/public/js/app_checklist.js b/public/js/app_checklist.js
index 6ac7911..8c3b9c8 100644
--- a/public/js/app_checklist.js
+++ b/public/js/app_checklist.js
@@ -155,7 +155,8 @@ window.addEventListener('DOMContentLoaded', async function () {
     }
 
     const DEFAULT_COMPLETION_MODAL = Object.freeze({
-      title: (window.i18n && typeof window.i18n.t === 'function') ? window.i18n.t('checklist.congratulations') : 'Congratulations! very nice 🎉🎉🎉',
+      // Default title: use the localized 100% modal title if available.
+      title: t('admin.modal100.defaultTitle', 'Congratulations! very nice 🎉🎉🎉'),
       bodyText: '',
       videoSrc: 'video/reward.mp4',
       bodyHtml: ''
@@ -194,7 +195,12 @@ window.addEventListener('DOMContentLoaded', async function () {
       const videoEl = document.getElementById('rewardVideo');
       const videoSourceEl = document.getElementById('rewardVideoSource');
 
-      const title = String(content?.title || '').trim() || DEFAULT_COMPLETION_MODAL.title;
+      const rawTitle = String(content?.title || '').trim();
+      // If the stored value is the i18n key itself, translate it; otherwise
+      // use the stored title, falling back to the localized default.
+      const title = (!rawTitle || rawTitle === 'admin.modal100.defaultTitle')
+        ? t('admin.modal100.defaultTitle', 'Congratulations! very nice 🎉🎉🎉')
+        : rawTitle;
       const bodyText = String(content?.bodyText || '');
       const bodyHtml = sanitizeHtml(String(content?.bodyHtml || ''));
       const videoSrc = String(content?.videoSrc || '').trim();
diff --git a/public/js/app_control.js b/public/js/app_control.js
index 095d1d6..f85a39b 100644
--- a/public/js/app_control.js
+++ b/public/js/app_control.js
@@ -1637,7 +1637,8 @@ window.onload = async function () {
     if (!dbBackupListBody) return;
     const list = Array.isArray(backups) ? backups : [];
     if (!list.length) {
-      dbBackupListBody.innerHTML = '<tr><td colspan="4" class="text-muted">Aucune sauvegarde.</td></tr>';
+      const emptyText = t('admin.backup.noBackups', 'No backups found.');
+      dbBackupListBody.innerHTML = `<tr><td colspan="4" class="text-muted">${emptyText}</td></tr>`;
       return;
     }
 
diff --git a/public/locales/en.json b/public/locales/en.json
index 51f4a0b..d83ab96 100644
--- a/public/locales/en.json
+++ b/public/locales/en.json
@@ -377,6 +377,8 @@
   "admin.modal100.videoLabel": "Video",
   "admin.modal100.videoInfoShort": "accepts relative path (e.g.: video/reward.mp4) or full URL.",
 
+  "admin.modal100.defaultTitle": "Congratulations! very nice 🎉🎉🎉",
+
   "admin.users.usersCount": "user(s)",
   "admin.users.addUser": "Add user",
   "admin.users.name": "Name",
@@ -488,6 +490,7 @@
   "admin.backup.downloadDesc": "retrieves the file locally (useful before a risky operation).",
   "admin.backup.restoreHowDesc": "imports the file. With drop, restored collections are deleted first.",
   "admin.backup.quickCheck": "Quick check",
+  "admin.backup.noBackups": "No backups found.",
   "admin.backup.quickCheckDesc": "After restore, reload the page and check \"Films\", \"Checklist\" and \"Stats\".",
   "admin.backup.confirmDelete": "Delete backup \"{name}\"?",
   "admin.backup.creating": "Creating…",
diff --git a/public/locales/fr.json b/public/locales/fr.json
index 7830eef..1f27797 100644
--- a/public/locales/fr.json
+++ b/public/locales/fr.json
@@ -488,6 +488,7 @@
   "admin.backup.restoreWarning": "La restauration peut écraser les données. Fais un backup juste avant si besoin.",
   "admin.backup.backupFile": "Fichier de backup",
   "admin.backup.dropBeforeRestore": "Drop les collections avant restore (recommandé)",
+  "admin.backup.noBackups": "Aucune sauvegarde.",
   "admin.backup.tip": "Conseil",
   "admin.backup.tipDesc": "Utilise drop sauf si tu sais exactement ce que tu fais (sinon risque de doublons/erreurs).",
   "admin.backup.howItWorks": "Fonctionnement",