Add warning on friendly player nameplate customization limitations.

[physixtential]

Add a warning on the friendly player tab at the top that clearly explains that "Blizzard has severely restricted friendly nameplate customization in dungeons. Class colors etc. are not possible inside dungeons."

Or whatever the most accurate concise explanation is. This causes many people much confusion and wasted effort trying to figure out why they spent hours customization plates that completely go away once they zone into their M+ run.