Merge pull request #895 from danielhjames/v4.3

Update copyright notices in dashboard widgets
fix menu issues when no issues are added
Release of new version 4.3.1
corrected upgrade guide
Merge branch 'v4.3' of https://github.com/sourcefabric/Newscoop into v4.3
Merge pull request #896 from takeit/v4.3

corrected upgrade guide for v4.3.x
CS-4766 Fix several issues with translation of support settings