Added translations management

Prepares work for line voiceovers management.

game/ui/commons/main_menu/main_menu.gd

@@ -5,6 +5,18 @@ func _ready():
 	escoria.esc_level_runner.set_sound_state(["bg_music", 
 		"res://game/sfx/Game-Menu_Looping.mp3", true])
 
+
+func _on_continue_pressed():
+	pass
+
+
+
+
+
+func switch_language(lang : String):
+	TranslationServer.set_locale(lang)
+
+
 func _on_new_game_pressed():
 	escoria.new_game()
 
@@ -12,9 +24,19 @@ func _on_load_game_pressed():
 	#  Show Loading screen
 	pass
 
+func _on_options_pressed():
+	$Panel/main.hide()
+	$Panel/options.show()
+
 func _on_quit_pressed():
 	get_tree().quit()
 
+###########################################################################
+###########################################################################
+# OPTIONS
 
-func _on_continue_pressed():
-	pass # Replace with function body.
+
+func _on_back_pressed():
+	$Panel/options.hide()
+	$Panel/main.show()
+