The {field_errors} tag pair just outputs the error - no label or any indication of what the error is in relationship to. It also looks like it shows double the errors.

So if you have 2 missing required fields you get:

This field is required.
This field is required.
This field is required.
This field is required.

I see where that happens- there's one error for field_id_x key and one for the actual label- in the channel_form_lib.php around 1602.

We need to either give them a {label} variable or include the label in the {error} like it's done in the message when not using inline errors. And also not double it up.