language settings reset at each run

[Zajdalen]

Using linux lite (ubuntu derivate) 6.2 fully updated and Tuxtype installed from snap. Deafult language is english and if I change it to my language to teach my kids, it works fine. But when kids close app, and start it again, it is in english not in language I set before. It is difficult for them because they learning to read in their native language and now they must use app in english....dont know where is the problem, why settings are not saved for next run