added service for content tabs
routed to form with tab
removed error causing attributes from form view
fixed tests
adjusted SuluProductContentNavigation to match new items
used new tabs in add formulars
introduced tabs
changed names of javascript components
return view for product variants
implemented list action for VariantController
added variants to an own tab
updated headers to match new structure
adjusted list display for variants
implemented action for adding a variant
added overlay
sending correct request
fixed variant controller
center overlay after loading datagrid
transfered variant from one list to the other
implemented delete variant action