Customize: Allow 0:00-0:59 in date/time control when 24-hour time used.

* Let min hour be 0 and max be 23 in 24-hour time; let min hour be 1 and max be 12 in 12-hour time.
* Show error notification when an invalid date value is provided, not just when not a future date.
* Fix translation of custom validity message.
* Start checking for validity after all inputs have been initially populated.
* Remove support for being able to enter 24:00.
* Cease forcing date input elements from being casted to integers, to allow for invalid inputs to be detected.

Props westonruter, Presskopp, peterwilsoncc, atachibana for testing.
See #39896, #28721.
Fixes #42373.


git-svn-id: https://develop.svn.wordpress.org/trunk@42042 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -599,6 +599,8 @@ function wp_default_scripts( &$scripts ) {
 			esc_url( admin_url( 'theme-install.php' ) )
 		),
 		'publishSettings' => __( 'Publish Settings' ),
+		'invalidDate'     => __( 'Invalid date.' ),
+		'invalidValue'    => __( 'Invalid value.' ),
 	) );
 	$scripts->add( 'customize-selective-refresh', "/wp-includes/js/customize-selective-refresh$suffix.js", array( 'jquery', 'wp-util', 'customize-preview' ), false, 1 );