Accessibility: Standardize the remove/delete/cancel links in the Menus screen and Publish meta boxes.

The `submitdelete` CSS class is used in various places across the admin for some
"red" action links. It is worth simplifying this rule for further improvements
related to color contrast.

- simplifies a non-standard styling for the "Remove/Cancel" links in the Menus screen
- underlines all the "Move to trash/Delete" red links in all the Publish meta boxes
- fixes CSS classes usage for all the Publish meta boxes primary buttons
- fixes broken layout for the old Link Manager publish meta box

Props karmatosed, hugobaeta, monikarao, afercia.
Fixes #37969, #37018. See #37448, #37138, #27314.

Built from https://develop.svn.wordpress.org/trunk@38616


git-svn-id: http://core.svn.wordpress.org/trunk@38559 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/edit-rtl.css

@@ -129,23 +129,10 @@ input#link_url {
 	float: right;
 }
 
-.submitbox .submitdelete {
-	text-decoration: none;
-	padding: 1px 2px;
-}
-
 body.post-new-php .submitbox .submitdelete {
 	display: none;
 }
 
-/* @todo: do we really need this? word on the street is we don't and this
-stray rule may actually be compensated for elsewhere. */
-#normal-sortables .submitbox .submitdelete:hover {
-	color: #000;
-	background-color: #f00;
-	border-bottom-color: #f00;
-}
-
 .submitbox .submit a:hover {
 	text-decoration: underline;
 }
@@ -644,6 +631,7 @@ span.wp-media-buttons-icon:before {
 	margin-top: 3px;
 }
 
+#linksubmitdiv .inside, /* Old Link Manager back-compat. */
 #poststuff #submitdiv .inside {
 	margin: 0;
 	padding: 0;