repo-groups: add personal flag indicator in advanced view.

personal-repo-group: update ui on auto-selecting the personal repo group on forks, edit/create repo

visual-settings: added personal metatag which is also recognizable.

i18n: expose custom name to catch the translation strings.

tests: improve detection of empty flash messages during the tests

tests: api add_user tests for personal groups

tests: fixed tests for personal repo groups

repo-groups: implemented default personal repo groups logic. - fixes #4003 - adds new settings to automatically create personal repo groups for users on API cal, add user form, registration - it's possible to create a pattern based repo group for example /u/{username}

hgignore: skip rhodecode-components.js generated package.

authentication-views: fixed old style exception catch syntax.