After upgrade OJS 3.0.0-2 to 3.1.1.-4 switching locales does not work properly

After upgradeof OJS to locale switching has issues. Actually, There should be English and Serbian cyrillic. In OJS version OJS there was only Serbian latin. After upgrade When I use Serrbian latin it does not show latin menus properly but it displayscyrillich metadata. When I swithc to Serbian cyrllic it does not show metadata on cyrillic and displays all other things i.e. menus, announcements in English. SO that is rather some glitch and it is not translation issue. Please advise