Requesting a tag alias for the series Squid Girl

squid_girl <-> shinryaku!_ikamusume

Reason: This could go either way, depending on which language is preferred

English: squid_girl
Japanese: shinryaku!_ikamusume

There's also the character ikamusume, which could be written as ika_musume, so probably an alias of that as well

ika_musume <-> ika_musume

Reason: Spelling disambiguity

English is preferred, so we'll just go with squid_girl.