Language settings updates, new primary language setting (#1471)

* move content languages to screen

* add dropdown library, style primary lang select

* update settings button

* show selected langauges in button

* use primary language in translator link

* update copy

* lint

src/lib/routes/types.ts

@@ -10,6 +10,7 @@ export type CommonNavigatorParams = {
   ModerationMutedAccounts: undefined
   ModerationBlockedAccounts: undefined
   Settings: undefined
+  LanguageSettings: undefined
   Profile: {name: string; hideBackButton?: boolean}
   ProfileFollowers: {name: string}
   ProfileFollows: {name: string}