Gokugetsu Academy -> Gokugetsu Gakuen

BUR #56518 has been approved by @nonamethanks.

create alias gokugetsu_academy_school_uniform -> gokugetsu_gakuen_school_uniform

I tried this last in forum #366061, but it timed out. Trying this again because it's still inconsistent with hatsuboshi gakuen school uniform and the copytag Gakuen Idolmaster.

Why is hatsuboshi gakuen school uniform named like that? Shouldn't that be the one that gets changed?

Actually, seems we have a lot of *_gakuen_* tags, so I guess it doesn't matter.

The bulk update request #56518 (forum #424509) has been approved by @nonamethanks.