Disallow password change for shibboleth users (optional)
Allow adhocracy.registration_support_email as from.

When using different email adresses for registration and general
support, for some mass messages it is more appropriate to use the
registration support address. Specifically, invitations.
Fixes hhucn/adhocracy.hhu_theme#353.
Fix follow/watch URL.
PEP-8
fix typo
Merge pull request #438 from wawe/feature-use-registration-email-in-massmessage

Allow adhocracy.registration_support_email as from.
Set sorting_orders in badge/add
Fix naming conflict.
Add votedetail to the JSON result of poll/rate actions.

This is needed to update the UI when using AJAX calls for
voting.
pep8
Use the same sort labels for solr and DB pagers.
Merge pull request #440 from wawe/feature-votedetail-poll-controller

Include votedetail in poll/rate actions.
Update english translations.

Fixes hhucn/adhocracy.hhu_theme#347.
Merge remote branch 'origin/develop' into track-outgoing-links
[track outgoing links] Move into own library and apply everywhere