[APPROVED] Tag alias: cum_in_uterus -> internal_cumshot

create alias cum_in_uterus -> internal_cumshot

Noticed while browsing that someone's started a cum in uterus tag, which is now at ~50 posts. This is pretty much being used the same way as internal cumshot (there's maybe ~1% of posts in that tag that *don't* show ejaculation into the uterus). While I could just manually update them since it's a small amount of posts, I feel like this is something that should be aliased.

Edit: Edited for clarification.

EDIT: The tag alias cum_in_uterus -> internal_cumshot (forum #142350) has been approved by @NWF_Renim.