diff --git a/manifest.firefox.json b/manifest.firefox.json
index af05674..ab79548 100644
--- a/manifest.firefox.json
+++ b/manifest.firefox.json
@@ -34,6 +34,9 @@
       "matches": ["<all_urls>"]
     }
   ],
+  "content_security_policy": {
+    "extension_pages": "script-src 'self'; object-src 'self'"
+  },
   "icons": {
     "16":  "assets/icons/icon16.png",
     "48":  "assets/icons/icon48.png",
diff --git a/manifest.json b/manifest.json
index bb4466e..28fe544 100644
--- a/manifest.json
+++ b/manifest.json
@@ -19,6 +19,9 @@
       "matches": ["<all_urls>"]
     }
   ],
+  "content_security_policy": {
+    "extension_pages": "script-src 'self'; object-src 'self'"
+  },
   "icons": {
     "16":  "assets/icons/icon16.png",
     "48":  "assets/icons/icon48.png",
diff --git a/manifest.opera.json b/manifest.opera.json
index 7cd00a5..ae49789 100644
--- a/manifest.opera.json
+++ b/manifest.opera.json
@@ -40,6 +40,9 @@
     "default_title": "Hellion Dashboard"
   },
 
+  "content_security_policy": {
+    "extension_pages": "script-src 'self'; object-src 'self'"
+  },
   "icons": {
     "16": "assets/icons/icon16.png",
     "48": "assets/icons/icon48.png",
diff --git a/newtab.html b/newtab.html
index df339a3..93ff1a5 100644
--- a/newtab.html
+++ b/newtab.html
@@ -53,7 +53,7 @@
         <span id="searchEngineIcon">G</span>
       </button>
       <input type="text" class="search-input" id="searchInput" data-i18n-placeholder="search.placeholder" placeholder="Search the web…" autocomplete="off" />
-      <button class="search-submit" id="searchSubmit">
+      <button class="search-submit" id="searchSubmit" data-i18n-title="search.submit_title">
         <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5"><circle cx="11" cy="11" r="8"/><line x1="21" y1="21" x2="16.65" y2="16.65"/></svg>
       </button>
     </div>
@@ -86,7 +86,7 @@
   <aside class="notebook-panel" id="notebookPanel">
     <div class="notebook-header">
       <span class="notebook-header-title"><span data-i18n="notebook.title">Notebook</span> <span class="notebook-count" id="notebookCount">0 / 5</span></span>
-      <button class="btn-close" id="btnCloseNotebook">✕</button>
+      <button class="btn-close" id="btnCloseNotebook" data-i18n-title="dialog.close">✕</button>
     </div>
     <div class="notebook-slots" id="notebookSlots">
       <!-- dynamisch via JS -->
@@ -106,7 +106,7 @@
   <aside class="settings-panel" id="settingsPanel">
     <div class="panel-header">
       <span data-i18n="settings.title">Einstellungen</span>
-      <button class="btn-close" id="btnCloseSettings">✕</button>
+      <button class="btn-close" id="btnCloseSettings" data-i18n-title="dialog.close">✕</button>
     </div>
     <div class="panel-body">
 
@@ -294,7 +294,7 @@
     <div class="theme-modal" id="themeModal">
       <div class="modal-header">
         <span data-i18n="modal.theme_header">Darstellung</span>
-        <button class="btn-close" id="btnCloseTheme">✕</button>
+        <button class="btn-close" id="btnCloseTheme" data-i18n-title="dialog.close">✕</button>
       </div>
       <div class="theme-grid">
         <div class="theme-card active" data-value="nebula">
@@ -439,7 +439,7 @@
     <div class="modal">
       <div class="modal-header">
         <span data-i18n="modal.new_board">New Board</span>
-        <button class="btn-close" id="btnCancelBoard">✕</button>
+        <button class="btn-close" id="btnCancelBoard" data-i18n-title="dialog.close">✕</button>
       </div>
       <div class="modal-body">
         <input type="text" class="text-input full-width" id="newBoardName" data-i18n-placeholder="modal.board_name" placeholder="Board name..." maxlength="40" />
@@ -455,7 +455,7 @@
     <div class="modal">
       <div class="modal-header">
         <span data-i18n="modal.new_bookmark">New Bookmark</span>
-        <button class="btn-close" id="btnCancelBookmark">✕</button>
+        <button class="btn-close" id="btnCancelBookmark" data-i18n-title="dialog.close">✕</button>
       </div>
       <div class="modal-body">
         <input type="text" class="text-input full-width" id="newBmTitle" data-i18n-placeholder="modal.bm_title" placeholder="Title..." maxlength="60" />
@@ -473,7 +473,7 @@
     <div class="modal">
       <div class="modal-header">
         <span data-i18n="modal.rename">Rename</span>
-        <button class="btn-close" id="btnCancelRename">✕</button>
+        <button class="btn-close" id="btnCancelRename" data-i18n-title="dialog.close">✕</button>
       </div>
       <div class="modal-body">
         <input type="text" class="text-input full-width" id="renameInput" data-i18n-placeholder="modal.rename_placeholder" placeholder="New name..." maxlength="60" />
diff --git a/src/js/i18n.js b/src/js/i18n.js
index 313c299..f3c053d 100644
--- a/src/js/i18n.js
+++ b/src/js/i18n.js
@@ -10,6 +10,7 @@ const STRINGS = {
     'dialog.ok':               'OK',
     'dialog.confirm_title':    'Bestätigung',
     'dialog.cancel':           'Abbrechen',
+    'dialog.close':            'Schließen',
 
     // Boards
     'boards.empty_state_pre':  'Noch keine Boards. Klicke auf ',
@@ -56,6 +57,7 @@ const STRINGS = {
     'onboarding.s5.text':      'Deine Daten sind lokal im Browser gespeichert. Wenn du Browserdaten löschst, gehen sie verloren! Sichere regelmäßig über Settings → Data → Export. Wir erinnern dich alle 7 Tage daran.',
     'onboarding.s6.title':     'Gaming Starter Board',
     'onboarding.s6.text':      'Spielst du Games wie Satisfactory, Factorio oder Star Citizen? Ich kann ein Board mit nützlichen Community-Links anlegen.',
+    'onboarding.tradecenter_desc': 'Trade Center für Star Citizen',
     'onboarding.s7.title':     'Bereit!',
     'onboarding.s7.text':      'Erstelle dein erstes Board mit „+ Board" oder importiere deine Browser-Lesezeichen über den Import-Button im Header. Viel Spaß!',
 
@@ -299,6 +301,7 @@ const STRINGS = {
 
     // Suche
     'search.placeholder':      'Im Web suchen…',
+    'search.submit_title':     'Suchen',
 
     // Widget-Toolbar Tooltips
     'toolbar.note':            'Note erstellen',
@@ -315,6 +318,7 @@ const STRINGS = {
     'dialog.ok':               'OK',
     'dialog.confirm_title':    'Confirmation',
     'dialog.cancel':           'Cancel',
+    'dialog.close':            'Close',
 
     // Boards
     'boards.empty_state_pre':  'No boards yet. Click ',
@@ -361,6 +365,7 @@ const STRINGS = {
     'onboarding.s5.text':      'Your data is stored locally in the browser. If you clear browser data, it\'s gone! Back up regularly via Settings → Data → Export. We\'ll remind you every 7 days.',
     'onboarding.s6.title':     'Gaming Starter Board',
     'onboarding.s6.text':      'Do you play games like Satisfactory, Factorio or Star Citizen? I can create a board with useful community links.',
+    'onboarding.tradecenter_desc': 'Trade Center for Star Citizen',
     'onboarding.s7.title':     'Ready!',
     'onboarding.s7.text':      'Create your first board with "+ Board" or import your browser bookmarks via the Import button in the header. Have fun!',
 
@@ -604,6 +609,7 @@ const STRINGS = {
 
     // Search
     'search.placeholder':      'Search the web…',
+    'search.submit_title':     'Search',
 
     // Widget toolbar tooltips
     'toolbar.note':            'Create note',
@@ -647,7 +653,9 @@ function applyLanguage() {
     el.placeholder = t(el.dataset.i18nPlaceholder);
   });
   document.querySelectorAll('[data-i18n-title]').forEach(el => {
-    el.title = t(el.dataset.i18nTitle);
+    const text = t(el.dataset.i18nTitle);
+    el.title = text;
+    el.setAttribute('aria-label', text);
   });
 }
 
diff --git a/src/js/image-ref.js b/src/js/image-ref.js
index 2f52433..09f1279 100644
--- a/src/js/image-ref.js
+++ b/src/js/image-ref.js
@@ -294,7 +294,7 @@ const ImageRef = {
       // Widget-Titel aktualisieren
       const entry = WidgetManager._widgets.get(imageData.id);
       if (entry) {
-        const titleEl = entry.el.querySelector('.widget-title-text');
+        const titleEl = entry.el.querySelector('.widget-title');
         if (titleEl) titleEl.textContent = text || t('imageref.title');
         entry.state.title = text || t('imageref.title');
       }
diff --git a/src/js/onboarding.js b/src/js/onboarding.js
index e5acd2f..c51342c 100644
--- a/src/js/onboarding.js
+++ b/src/js/onboarding.js
@@ -215,7 +215,7 @@ const Onboarding = {
         { id: uid(), title: 'Modrinth (Mods)', url: 'https://modrinth.com', desc: '' },
         { id: uid(), title: 'Star Citizen Wiki', url: 'https://starcitizen.tools', desc: '' },
         { id: uid(), title: 'UEX Corp (Trading)', url: 'https://uexcorp.space', desc: '' },
-        { id: uid(), title: 'Hellion TradeCenter', url: 'https://hellion-initiative.online/tradecenter', desc: 'Trade Center f\u00FCr Star Citizen' }
+        { id: uid(), title: 'Hellion TradeCenter', url: 'https://hellion-initiative.online/tradecenter', desc: t('onboarding.tradecenter_desc') }
       ],
       blurred: false
     };