[TYPO3-english] How to reflect week date and names of month in another language (as default)?

[Olga Zhuravleva]

Hi! I have news in 2 languages - russian and english. Default language of
plagin is russian.
Problem: I see inscriptions like week date and names of month at english,
not in russian at news page.
How to reflect week date and names of month in russian in tt_news (as
default)? It's seems to me, It's not depend on tt_news.