This is now enabled.
Start here: https://translatewiki.net/wiki/Special:Translate?filter=%21translated&action=translate&language=efi&group=core-0-mostused
Thanks.
Amir forgot to remove the option that disables the link to the TranslateUI. I did that in Portal:Efi.
And I also updated the few associated categories to remove the "disabled language" banner.
Thanks