[APP-718] Improvements and fixes to language handling (#931)

* Add locale helpers for narrowing languages

* Add a translate link to posts in a different language

* Update language filtering to use narrowing when multiple declared

* Fix a few more RTL layout cases

* Fix types

src/view/com/lists/ListCard.tsx

@@ -96,7 +96,7 @@ export const ListCard = ({
       {descriptionRichText ? (
         <View style={styles.details}>
           <RichTextCom
-            style={pal.text}
+            style={[pal.text, s.flex1]}
             numberOfLines={20}
             richText={descriptionRichText}
           />

src/view/com/lists/ListItems.tsx

@@ -347,6 +347,7 @@ const styles = StyleSheet.create({
     borderTopWidth: 1,
   },
   headerDescription: {
+    flex: 1,
     marginTop: 8,
   },
   headerBtns: {