Update: Strangely… I’ve completed some other quests and now I can Right-Click and accept the quests 
Still I can’t that little badge. After research I found out it’s for the Horde (I play Alliance): https://vanilla-twinhead.twinstar.cz/?quest=1269#.
Update: Strangely… I’ve completed some other quests and now I can Right-Click and accept the quests
Still I can’t that little badge. After research I found out it’s for the Horde (I play Alliance): https://vanilla-twinhead.twinstar.cz/?quest=1269#.