Translation Issue with WordPress Theme Check in comment_form function

The _x() function is meant to be used with the same string/text which has two or more different meanings/contexts, e.g. “read” can be a verb (I can read music.) or noun (It's a good read.).

And when you use _x(), the context is the second parameter and the text domain is the third parameter, but in your code, you incorrectly used _x(), where these are missing the context:

_x( 'Comment', 'the_mdttheme' )
_x( 'Comment *', 'the_mdttheme' )

But that would actually be seen as missing the text domain since it’s supposed to be the third parameter.

So either provide the context (and also do so with your POT file) or perhaps you meant to use __()? 🙂