Some languages cannot be loaded at launch

[ThePixelGamer]

The code currently saves the ISO639-3 language code from the language however the current loader uses minecraft's (or java's?) short language code. This causes issues with languages like French that use fra_FR.

To reproduce just set the language to fr_fr and restart the client, the language will not be loaded.

The French language should be loaded instead of the default fallbacks.

Windows 10 Pro 21H1 19043.2006