alias leg_only -> lower_body

BUR #49251 has been rejected.

create alias leg_only -> lower_body

this tag is pretty much just lower body. could be turned into a useful utility alias.

Yuck because "leg" isn't plural. Maybe nitpicky but still, yuck.

BUR #49254 has been approved by @evazion.

mass update leg_only -lower_body -> lower_body
nuke leg_only
create alias legs_only -> lower_body

plural alternative per WRS' suggestion.

The bulk update request #49254 (forum #393018) has been approved by @evazion.

The bulk update request #49251 (forum #393008) has been rejected by @evazion.