Forum Changing Header where '{1} - Powered by vBulletin' Used to be
 

I've tried editing the x_powered_by_vbulletin phrase to omit the 'powered by vBulletin' and include a more apt descriptor after the name of my forum.

After changing the phrase to {1} - forum description, the changes aren't being reflected. Is there anyway to edit the templates so that I can manually add a descriptor to the header title?