6288: crash: no attribute 'require_version'


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21099 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Updates to navigation sidebar

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21104 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
updated dutch translation

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21105 4ae1f11a-8b86-4847-b8af-ab372f36d1fd