I can choose language for my content in one of instalation steps.

Installer creates all content in my choosen language. But classes remains in English UK. Because of this, when i create new object, i'm asked to chosse languge, even i have choosen to use only one languge (not english).

Also i cannot remove english uk from language list until i convert all classes to my choosen language, and remove english uk translation from each class.

Can it be done in similat way, as it is done with ezwebin content instalation: if i haven't choosen english uk, installer offers to map english uk to one of my choosen languages.
And one more improovement, if i have choseeh only one language, it should automaticaly map to that language.