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

src/apps/officer-web/locales/es-ES.json

@@ -478,11 +478,11 @@
     "codeEditor": "Editor de código"
   },
   "theme": {
-    "pillTitle": "Tema: {{name}}  ·  ctrl+shift+←/→ recorrer · ctrl+shift+space explorar · ctrl+shift+f {{starAction}}",
+    "pillTitle": "Tema: {{name}}  ·  ctrl+shift+←/→ recorrer · ctrl+shift+↑/↓ explorar · ctrl+shift+f {{starAction}}",
     "pillLabel": "Tema: {{name}}",
     "star": "marcar",
     "unstar": "desmarcar",
-    "cycleHint": "ctrl+shift+←/→ recorrer · ctrl+shift+space explorar",
+    "cycleHint": "ctrl+shift+←/→ recorrer · ctrl+shift+↑/↓ explorar",
     "everyShortcutHint": "ctrl+? para todos los atajos",
     "favouritesOnly": "Solo favoritos ({{count}})",
     "favourites": "Favoritos ({{count}})",