Boone Gorges 8072fe7db6 Improved customizability for the Submit button in comment_form().
The new 'submit_button' and 'submit_field' parameters for `comment_form()`
allow developers to modify the markup of the submit button and its wrapper.
These params are accompanied by targeted 'comment_form_submit_button' and
'comment_form_submit_field' filters on the concatenated markup.

Props coffee2code, morpheu5, DrewAPicture, boonebgorges.
Fixes #15015.

git-svn-id: https://develop.svn.wordpress.org/trunk@31699 602fd350-edb4-49c9-b593-d223f7449a82
2015-03-10 19:07:31 +00:00
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