defloration -> virgin alias reversal

BUR #4956 has been approved by @evazion.

create alias virgin -> defloration

See the discussion in forum #164423. Gonna go with the simplest option to avoid endless discussions.

The virgin tag is for defloration. As virginity can be shown in other ways than defloration, such as intact hymens or talking about virginity, this tag name is bad and must be changed.

Since the virgin tag doesn't apply to male virgins, which we can't tell just by seeing, this is acceptable.

The bulk update request #4956 (forum #182389) has been approved by @evazion.