Error in person.get_citation_child_list. Causes error in merging citation in person event reference attribute. (Discovered during investigation of 0006336: Delayed update of bottom bar in Person View after merge)

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21196 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
GrampsLocale: Fix missing "operating_system" value

Inadvertently deleted the creation in r21143

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21197 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Fix unhandled exception in expandersidebar

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21198 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
[Bug #6361] try to run soundex tool

Updated for python3

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21199 4ae1f11a-8b86-4847-b8af-ab372f36d1fd