Fix some Scribe translations

- Added missing translations
- Removed missing translations
- Some small translations updates

lib/l10n/intl_fr.arb

@@ -5492,12 +5492,6 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "aiAssistant": "Assistant IA",
-  "@aiAssistant": {
-    "type": "text",
-    "placeholders_order": [],
-    "placeholders": {}
-  },
   "createLabel": "Créer un libellé",
   "@createLabel": {
     "type": "text",

lib/l10n/intl_ru.arb

@@ -5510,12 +5510,6 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "aiAssistant": "Помощник ИИ",
-  "@aiAssistant": {
-    "type": "text",
-    "placeholders_order": [],
-    "placeholders": {}
-  },
   "createLabel": "Создать метку",
   "@createLabel": {
     "type": "text",

lib/l10n/intl_vi.arb

@@ -5498,12 +5498,6 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "aiAssistant": "Trợ lý AI",
-  "@aiAssistant": {
-    "type": "text",
-    "placeholders_order": [],
-    "placeholders": {}
-  },
   "createLabel": "Tạo nhãn",
   "@createLabel": {
     "type": "text",