Use on-device translation on mobile when available (#9930)

Co-authored-by: Samuel Newman <mozzius@protonmail.com>

src/analytics/metrics/types.ts

@@ -2,6 +2,8 @@
  * Do not import runtime code into this file
  */
 
+import {type Platform} from 'react-native'
+
 import {type NotificationReason} from '#/lib/hooks/useNotificationHandler'
 import {type FeedDescriptor} from '#/state/queries/post-feed'
 import {type LiveEventFeedMetricContext} from '#/features/liveEvents/types'
@@ -679,6 +681,17 @@ export type Events = {
     targetLanguage: string
     textLength: number
   }
+  'translate:result': {
+    method: 'on-device' | 'google-translate' | 'fallback-alert'
+    os: Platform['OS']
+    sourceLanguage: string | null
+    targetLanguage: string
+  }
+  'translate:override': {
+    os: Platform['OS']
+    sourceLanguage: string
+    targetLanguage: string
+  }
 
   'verification:create': {}
   'verification:revoke': {}