UI-2999: Incorrect tooltip style of some actions
PLF-5372 : UIGroupsNavigationPortlet: Slowness in readNavigationsAndCache() method
PLF-5372 :  UIGroupsNavigationPortlet: Slowness in readNavigationsAndCache() method (fix functional regression)
Merge branch 'feature/stabilization'
Merge branch 'master' into feature/ckeditor-upgrade