This patch uses the jQuery validator plugin introduced in
bug 6209 for two reasons:
[1] To supply validation for non-HTML5-compatible web
browsers.
[2] To force use of the validator plugin rather than
built-in validation for HTML5 browsers, which means
that our translations will be used.
Note that a version of the function to prevent double form submission
is used as the submit handler invoked when the validator plugin
is satisified that the form is complete.
To test:
[1] Same as the main test plan, but note that the validation
messages now appear inline rather than as pop-ups.
[2] Verify that the double form submission prevention still
works.
Signed-off-by: Galen Charlton <gmc@esilibrary.com>