6579: Check and Verify crashes


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21879 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
GrampsLocale: Better handling of unset $LANG or $LANG == 'C'

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21880 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
GrampsLocale: Ensure posix collation and calendar are set correctly

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21881 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
GrampsLocale: Improve windows handling of no locale

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21882 4ae1f11a-8b86-4847-b8af-ab372f36d1fd