[APP-690] better handling of post languages language filtering (#893)

* add SelectLangBtn

* memoized objects that are created to reduce re-creation on re-render

* add langs when uploading post

* only send the top 3 languages otherwise backend will throw error

* mv ContentLanguagesSettings to folder

* add post languages settings modal and state

* fix typos

* modify feed manip to also check langs label on post

* Fix tests

* Remove log

* Update feed-manip.ts

* Fix syntax errors

* UI tuneups

* Show the currently selected languages in the composer

* fix linting

* Use a bcp-47 matching function

* Fix a duplicate language issue

* Fix web

* Dont include lang in prompt

* Make select language btn an observer

* Keep device languages on top of language selection UIs

* Fix android build settings

* Enforce a max of 3 languages in posts

* Fix tests

* Fix types

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Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/lib/functions.ts

@@ -4,3 +4,8 @@ export function choose<U, T extends Record<string, U>>(
 ): U {
   return choices[value]
 }
+
+export function dedupArray<T>(arr: T[]): T[] {
+  const s = new Set(arr)
+  return [...s]
+}