Thanks for your reply.
I'm testing in this moment, so also Vendor can be ok for the moment 😃
"The _lang_key was given as an example, the exact key may be different like _bx_acl_page_title_sys_view for example. "
Ok, I understand, but, what i must find?
This is an example of the beginning of content of modules\boonex\russian\data\langs\bx_accounts\ru.xml:
The bold text means the keys which should be "found", the crossed words mean the text which should be translated.