refactored WonMessageBuilder, adapted GroupFacet to new MessageFormat
Redirect to postbox after login. Will serve as a default until redirecting to last workflow step / 'login wherever they' are works
Removed commented out code.
Removed commented out code.
minor spelling changes
Merge branch 'devel' into feat-privatelink
minor changes

- security: access control changed
- register/signin/signup GUI: bootstrap components overlapping problem solved.