Fix icon path
Let WCF.Date.Picker respect the users localization
Insert a hidden element representing the date in Y-m-d format

Please remember to assign the elements default value in Y-m-d format. When sending the form, the server will receive the date in the same format.
Major icon overhaul
Removes obsolete prefilter
Removes obsolete code
Added missing CSS class
Merge branch 'master' of github.com:WoltLab/WCF
Removed obsolete code
Fixed spinner for slimbox 2
Fixed icons in setup
Merge branch 'master' of github.com:WoltLab/WCF
Added global language variable
optimizing date format converter regex
Fixed word wrap in StringUtil::truncateHTML()

Fixes #1102
Fixed show order calculation
Fixed small issue
Reloads application cache within setup
Merge branch 'master' of github.com:WoltLab/WCF
Fixed icon color