5751: use "Minimum Confidence" label into citation sidebar filter, it does not match only one level

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@22116 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
6669: Descriptions for file formats into Export dialog are ignored by the translation

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@22117 4ae1f11a-8b86-4847-b8af-ab372f36d1fd