LB-819: On timeline all posts are 2h before CET

Implement dust helper userdate for utc date strings.
APY-37: Implement internationalization scanner for dust/html files
* added the html type
(cherry picked from commit 0ba80c00b1f5636d9bfa8e869cb7a06556a95937)
Merge pull request #68 from msat-cont/liveblog-15

APY-37: Implement internationalization scanner for dust/html files
Merge pull request #62 from petrjasek/lb-819-timeline-date

Lb 819 timeline date
LB-954 : Manage Feeds-> Chained blog does not preserve the selection of chained blogs
LB-948 : The user comment don't recognize any captcha response
Merge remote-tracking branch 'sourcefabric/liveblog-15' into devel