[bulk] Tag Alias: undo "ghetis", do "ghetsis"

remove alias ghetis_(pokemon) -> geechisu_(pokemon)
create alias ghetsis_(pokemon) -> geechisu_(pokemon)

Link to request

EN typo correction

I thought his name was supposed to be romanized "G-Cis" after the musical notes.
He also has a surname, "Harmonia".

The bulk update request #597 has been approved.