I can't find some email templates

IHi

I am overriding all the email templates but I don't know where to find the templates for messages that use this kind of template:
apps/user/photos/comment.photo.item
apps/user/photos/like.photo.item
apps/user/photos/comment.photo.item

I have no problem with templates that start with site, like site/polls/vote.item
but the ones that start with apps/ I don't know where to find them.

Can you please point out where I can look for it and override them?

Thanks