Description of problem: i have polish pl_PL.UTF-8 locale but week starts on sunday - it should start on monday. i guess problem lies in /usr/lib/locale/pl_PL.utf8/LC_TIME file where sunday is defined as first day of the week, as far as i could inspect it.
There is no need to keep a bug open for each affected locale... *** This bug has been marked as a duplicate of 187611 ***