moved preview functionality to global stuff away from wiki
Merge pull request #541 from leider/master

moved preview functionality to global stuff away from wiki
preview functionality simplified and clearer
updated bootstrap-markdown
removed distinction in error handling depending on production or development mode
fix for layout quirk with language switch flags
version-update bootstrap
Merge pull request #542 from leider/master

preview functionality simplified and clearer (+some more small changes)
removed links to gdcr from sidebar and title page - added it to the activities drop down on activities page
Merge pull request #543 from leider/master

removed links to gdcr from sidebar and title page - added it to the acti...
mini display fix for administration view
Fix for printing activities.
Merge pull request #545 from leider/master

small fixes