Move language preferences to new persistence + context (#1837)

src/state/preferences/index.tsx

@@ -0,0 +1,8 @@
+import React from 'react'
+import {Provider as LanguagesProvider} from './languages'
+
+export {useLanguagePrefs, useSetLanguagePrefs} from './languages'
+
+export function Provider({children}: React.PropsWithChildren<{}>) {
+  return <LanguagesProvider>{children}</LanguagesProvider>
+}