GrampsLocale:Add Greek and English to MSlocales

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@22831 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Ensure en_US encoding is UTF-8

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@22832 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Fix crash when Gramps is passed an invalid locale

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@22833 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Remove redundant imports

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@22839 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Consolidate mslocales and self._lang_map

into a single dict for easier maintenance

Thanks to Paul Franklin for suggesting it

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@22840 4ae1f11a-8b86-4847-b8af-ab372f36d1fd