Shingeki no School Castes implication

BUR #50081 has been approved by @evazion.

create implication shingeki_no_school_castes -> shingeki_no_kyojin

Shingeki no School Castes is a spin-off of Shingeki no Kyojin.

The bulk update request #50081 (forum #396211) has been approved by @evazion.