delete question because can’t acceptable.
For version 4.15
In the Editor go to:
Edit (top menu bar) → Editor Preferences → Region & Language
how to change language in editor?
I have not tried doing this, but it looks like there is a localization folder in the engine that you could potentially add your own.
C:\Program Files (x86)\Epic Games\UE_4.15\Engine\Content\Localization
you shouldnt modify the question after posting it. even if it cant be solved maybe it would have helped someone else with the same issue in the future.