add newline at end of lib/hooks/hooks.rb
add newline at end of app/views/watchers/_multiselect_group.erb
Rails3 compatible: add html_safe to roles option tag
Rails3 compatible: use render_on on hook

Redmine issue 11105 fixed "content_for :header_tags" inside hook.
http://www.redmine.org/issues/11105
But, it does not work on :render_to_string.
It need to use "render_on".
German translation, moved content to watchers box