Crotch veil

BUR #12845 has been approved by @nonamethanks.

create alias crotch_veil -> pelvic_curtain
create alias pussy_veil -> pelvic_curtain
create alias waist_veil -> pelvic_curtain

Similar to pelvic curtain, I assume something like crotch veil is easier to think.

Three aliases seem unnecessary, but it's true that our tag is not very intuitive either unless you already know about it.

The bulk update request #12845 (forum #224380) has been approved by @nonamethanks.