Can now use the "icon" key for global operations in DCA too (see #5394)
Merge branch 'feature/global-operation-icon' of git://github.com/Toflar/contao-core-fork into feature/icon-for-global-operations

Conflicts:
	system/themes/default/main.css
Add the theme path and static URL
Merge branch 'feature/icon-for-global-operations' into develop