Add language dropdown to compose view (#2651)

* Add UI for selecting post language

* Apply selected language when sending status

* Save/restore post language with drafts

* Fall back to english if the configured language isn't found in the locale list (no-NB)

* Remove comment about no_NB

* Move language dropdown to top of compose view

* Preserve language when redrafting

* Set default language to target post's language when replying

* Add Tusky license header to new source file

* Tweak language dropdown button width

app/src/main/java/com/keylesspalace/tusky/receiver/SendStatusBroadcastReceiver.kt

@@ -98,7 +98,8 @@ class SendStatusBroadcastReceiver : BroadcastReceiver() {
                         draftId = -1,
                         idempotencyKey = randomAlphanumericString(16),
                         retries = 0,
-                        mediaProcessed = mutableListOf()
+                        mediaProcessed = mutableListOf(),
+                        null,
                     )
                 )