fix for validation category view

the validation for categoryview is updated, the "old" version was
messing around with the layout of the view. When pressing save and
getting an error it was showing the box at the right at the bottom.
Moved the color box to a seperate slider
fix lang.import, update of picker.js/css,

fixed language string for importview, added the updated picker.js &
picker.css file, altered the colum width of venues/categories