update IME action label

Closes #3649
fixes #3623
// FREEBIE

src/org/thoughtcrime/securesms/ConversationActivity.java

@@ -822,6 +822,7 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
         calculateCharactersRemaining();
         composeText.setHint(newTransport.getComposeHint());
         composeText.setImeActionLabel(newTransport.getComposeHint(), EditorInfo.IME_ACTION_SEND);
+        composeText.setInputType(composeText.getInputType());
         buttonToggle.getBackground().setColorFilter(newTransport.getBackgroundColor(), Mode.MULTIPLY);
       }
     });