Question [Q] How to localize SM-N900T to language of another country.

There is SM-N900T Baseband N900TUVUBMI7, but there's no Russian language.
1. How to enable system language of another country (ie, display, handwriting, voice control)?
2. How to remove operators app from T-mobile and other useless app?
3. How to update ROM to ROM SM-N9005 required region with preservation functioning of the network, core, etc.?