Fix 3.0.6 release notes
Use gettext in migrations verbose name to avoid spurous migrations
Merge pull request #3507 from yakky/feature/306_release_notes_31

Fix 3.0.6 release notes
Merge pull request #3512 from yakky/feature/migrations_verbose_name_31

Use gettext in migrations verbose name to avoid spurous migrations
Add empty 3.1 documentation files