Merge pull request #40 from nsendetzky/master

Fixes border radius if only one category is available
Merge pull request #41 from nsendetzky/master

Updates to latest Arcavias Core, creates demo data and extends CSP rules
Merge pull request #33 from cookiekiller/language_picker

Provides available translation languages to admin interface
Merge pull request #42 from cookiekiller/show_selected_language

Fixes locale variable which wasn't set correctly
Merge pull request #43 from nsendetzky/master

Updates and adapts to latest Arcavias Core
Merge pull request #44 from nsendetzky/master

Update to latest Arcavias core and uses "default" site with demo data by default
Uses stable branches of Arcavias Core and extensions