@MikhailSvidersky No need to be rude. It should be working since the version 4.0.09 launcher. Note that the launcher version is separate from the editor versions. What launcher version are you using? Can you please post your spine.log?

My guess is MikhailSvidersky's problem is not the same as what mfedorov described, though I can't be sure because he didn't actually describe a problem at all. Anyway, rather than have multiple threads for the same thing, we can continue this discussion here:
Spine Editor Language doesn't change