Fix localization for Following and Discover feed names (#11572)

src/lib/strings/feed-names.ts

@@ -0,0 +1,19 @@
+import {type I18n} from '@lingui/core'
+import {msg} from '@lingui/core/macro'
+
+import {DISCOVER_FEED_URI, TIMELINE_SAVED_FEED} from '#/lib/constants'
+
+type FeedNameSource = {
+  displayName: string
+  uri: string
+}
+
+export function getLocalizedFeedName(feed: FeedNameSource, i18n: I18n): string {
+  if (feed.uri === TIMELINE_SAVED_FEED.value) {
+    return i18n._(msg({message: 'Following', context: 'feed-name'}))
+  }
+  if (feed.uri === DISCOVER_FEED_URI) {
+    return i18n._(msg({message: 'Discover', context: 'feed-name'}))
+  }
+  return feed.displayName
+}