Basic functionality is now working again:

 * fixed missing translations
 * fixed several errors that derive from the issue/workpackage-changes
 * templates renamed (rhtml -> .html.erb)
 * several html_safe-issues fixed
 * mappings/routes changed (there are still two mappings missing)
 * basically copied the blocks from core/mypage(again!) to make it working: many of these blocks still don't make sense, as they are not limited to the project
 * several minor issues