i18n: palette section — wrap French descriptions in data-i18n spans

- Opening keyboard shortcuts descriptions
- File mode: type file name, API search, press Enter
- Command mode: type > to see actions
- 7 new help.pal_* keys with English translations

frontend/locales/en.json

@@ -1163,5 +1163,12 @@
   "help.desc_40c92863": "Exploration par tags : Cliquez sur un tag dans une note pour voir toutes les notes similaires",
   "help.desc_26f81732": "Édition rapide : Ouvrez l'éditeur, modifiez, sauvegardez",
   "help.desc_99c6f0ec": "Share files with a read-only link",
-  "help.desc_ecf302ae": "Multi-fenêtres : Ouvrez plusieurs notes dans des onglets séparés"
+  "help.desc_ecf302ae": "Multi-fenêtres : Ouvrez plusieurs notes dans des onglets séparés",
+  "help.pal_open_the_editor_on_the_active_tab": "Open the editor on the active tab",
+  "help.pal_delete_the_file_from_the_active_tab": "Delete the file from the active tab",
+  "help.pal_delete_a_folder_and_its_contents": "Delete a folder and its contents",
+  "help.pal_toggle_light_dark": "Toggle light/dark",
+  "help.pal_open_this_guide": "Open this guide",
+  "help.pal_open___select": "Open / select",
+  "help.pal_close_the_palette": "Close the palette"
 }