Added translations management

Prepares work for line voiceovers management.

game/ui/commons/main_menu/options.gd

@@ -0,0 +1,11 @@
+extends Control
+
+func _ready():
+	var locale = TranslationServer.get_locale()
+
+func greyout_other_languages(except_lang : String) -> void:
+	pass
+
+func _on_language_input(event : InputEvent, language : String):
+	if event.is_pressed():
+		TranslationServer.set_locale(language)