MultiMCManage Minecraft instances with ease

Finalizing the translation workflow improvements and adding fixes for sounds missing in old game versions.

New or changed features

• UI for the language settings has been unified across the application

• GH-2209: Sounds in old (pre-1.6) versions should now work again

  The launcher now downloads the correct assets and reconstructs the resources folder inside instances. This mirrors the same fix implemented in vanilla.

  Also, a minor issue with the reconstruction being done twice per launch has been fixed.