fix(tabs): support heading with :
fix(tabs): support heading with :

- Support `uib:tab-heading`

Closes #5590
Fixes #5568

benhalverson/bootstrap,byronigoe/bootstrap,benhalverson/bootstrap,caoruiy/bootstrap,292388900/bootstrap,shootermv/bootstrap,RobJacobs/bootstrap,angular-ui/bootstrap,icfantv/bootstrap,292388900/bootstrap,caoruiy/bootstrap,vfiles/bootstrap,christor/bootstrap,wesleycho/bootstrap,mabi/bootstrap,looker/bootstrap,benhalverson/bootstrap,fpipita/bootstrap,mabi/bootstrap,christor/bootstrap,angular-ui/bootstrap,fpipita/bootstrap,looker/bootstrap,Kpler/bootstrap,benhalverson/bootstrap,vfiles/bootstrap,BookingBug/bootstrap,Foxandxss/bootstrap,icfantv/bootstrap,BookingBug/bootstrap,Servoy/bootstrap,Servoy/bootstrap,Kpler/bootstrap,byronigoe/bootstrap,wesleycho/bootstrap,RobJacobs/bootstrap,shootermv/bootstrap,Foxandxss/bootstrap