spotlight on ctrl+space, theme browser on ctrl+shift+up/down, no backdrop behind the theme list

src/apps/officer-web/locales/fr-FR.json

@@ -478,11 +478,11 @@
     "codeEditor": "Éditeur de code"
   },
   "theme": {
-    "pillTitle": "Thème : {{name}}  ·  ctrl+shift+←/→ parcourir · ctrl+shift+space explorer · ctrl+shift+f {{starAction}}",
+    "pillTitle": "Thème : {{name}}  ·  ctrl+shift+←/→ parcourir · ctrl+shift+↑/↓ explorer · ctrl+shift+f {{starAction}}",
     "pillLabel": "Thème : {{name}}",
     "star": "marquer",
     "unstar": "démarquer",
-    "cycleHint": "ctrl+shift+←/→ parcourir · ctrl+shift+space explorer",
+    "cycleHint": "ctrl+shift+←/→ parcourir · ctrl+shift+↑/↓ explorer",
     "everyShortcutHint": "ctrl+? pour tous les raccourcis",
     "favouritesOnly": "Favoris uniquement ({{count}})",
     "favourites": "Favoris ({{count}})",