Translate number joined starter pack string and add plural formatting (#7984)

* translate number joined starter pack string

* also add plural formatting in StarterPackScreen.tsx

* import Plural

* tweak

* tweak

src/screens/StarterPack/StarterPackScreen.tsx

@@ -9,7 +9,7 @@ import {
   RichText as RichTextAPI,
 } from '@atproto/api'
 import {FontAwesomeIcon} from '@fortawesome/react-native-fontawesome'
-import {msg, Trans} from '@lingui/macro'
+import {msg, Plural, Trans} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 import {useNavigation} from '@react-navigation/native'
 import {NativeStackScreenProps} from '@react-navigation/native-stack'
@@ -482,9 +482,12 @@ function Header({
               />
               <Text
                 style={[a.font_bold, a.text_sm, t.atoms.text_contrast_medium]}>
-                <Trans>
-                  {starterPack.joinedAllTimeCount || 0} people have used this
-                  starter pack!
+                <Trans comment="Number of users (always at least 25) who have joined Bluesky using a specific starter pack">
+                  <Plural
+                    value={starterPack.joinedAllTimeCount || 0}
+                    other="# people have"
+                  />{' '}
+                  used this starter pack!
                 </Trans>
               </Text>
             </View>