6258: Error during start of Gramps for certain LANG values


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@20949 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Recover gracefully from some errors in python3


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@20951 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Fix exec problem in python 2 after previous change


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@20955 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
FIX MAJOR ERROR blocking upgrade of old family trees !


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@20957 4ae1f11a-8b86-4847-b8af-ab372f36d1fd