Quote Originally Posted by simon1066 View Post
These two files should actually be located in \includes\modules\payment\square_support and they are not language files.
Correct.
Quote Originally Posted by simon1066 View Post
I'm not sure why you're getting missing language file errors for them.
The error is because ZC attempts to automatically load a language file for all files in the modules directory. So putting files in the modules directory will cause this problem if the files don't belong there.