I would already be happy if tabs from challenge leagues and races would be added at the end of the stash...
The autogeneration of tabs is still wobbly. You can try the "claim and reclaim" tetris approach if you want or just email Support right away :-D So far, getting a new tab took less than 15 minutes for me each time.
Of the translations that GGG has commissioned and as far as we know, German is practically done and French should be almost there, too. At least there were translation previews in the past for French, too.
Spanish should be on the to-do list, too but no idea on priorities and potential release dates. Especially since the number of native speakers doesn't necessarily equal the actual share of the player base.