fix: full i18n for Navigation + Tabs help sections

- 15 LI descriptions wrapped in data-i18n spans
- 2 filter paragraphs tagged
- 3 tab navigation descriptions fixed
- All EN translations provided
- 914 locale keys

frontend/locales/en.json

@@ -902,5 +902,21 @@
   "help.desc_287be69c": ":\n                                    Réduisez les sections Vaults/Tags selon vos\n                                    besoins",
   "help.desc_cb6f0bfd": ": Ouvrez\n                                    l'éditeur, modifiez, sauvegardez",
   "help.desc_f9083ce5": ": Téléchargez des\n                                    fichiers pour backup ou partage",
-  "help.desc_9cb5974c": ": Ouvrez\n                                    plusieurs notes dans des onglets séparés"
+  "help.desc_9cb5974c": ": Ouvrez\n                                    plusieurs notes dans des onglets séparés",
+  "help.desc_expand": ": Click on a folder",
+  "help.desc_open_file": ": Click on the file name",
+  "help.desc_instant_filter": ": Type to filter files and folders",
+  "help.desc_case_sensitive": ": \"Aa\" button to respect case",
+  "help.desc_grouped_results": ": Display by vault with full paths",
+  "help.desc_click_vault": ": Focus on the vault in the sidebar",
+  "help.desc_click_segment": ": Navigate to that folder",
+  "help.desc_autoscroll": ": The sidebar positions itself automatically",
+  "help.desc_menu_header": ": \"Vault\" dropdown in the Options menu",
+  "help.desc_all_vaults": ": Global view of all your content",
+  "help.desc_specific_vault": ": Focus on a single vault",
+  "help.desc_double_click": ": Opens the file in a persistent tab",
+  "help.desc_click_tab": ": Activates the tab",
+  "help.desc_ctrl_tab": ": Next tab",
+  "help.desc_ctrl_w": ": Close the active tab",
+  "help.desc_close_btn": ": Closes the tab (unless it's the only one)"
 }