Accessibility: Improve readability by removing unnecessary italic font style.

Per Web Content Accessibility Guidelines 2.0, big chunks of italic text should be avoided.
Same applies to UI controls, since they're meant to be comfortably readable by the largest possible audience, e.g.: label elements.

Removes italic font style from:
- the Quick Edit / Bulk Edit forms
- the Recovery Mode plugin error details
- the Image Editor inline help

Props birgire, audrasjb, SergeyBiryukov, melchoyce, estelaris, sabernhardt, xkon, nrqsnchz, afercia.
See #47327.


git-svn-id: https://develop.svn.wordpress.org/trunk@47304 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-posts-list-table.php

@@ -1608,12 +1608,12 @@ class WP_Posts_List_Table extends WP_List_Table {
 							<span class="input-text-wrap"><input type="text" name="post_password" class="inline-edit-password-input" value="" /></span>
 						</label>
 
-						<em class="alignleft inline-edit-or">
+						<span class="alignleft inline-edit-or">
 							<?php
 							/* translators: Between password field and private checkbox on post quick edit interface. */
 							_e( '&ndash;OR&ndash;' );
 							?>
-						</em>
+						</span>
 						<label class="alignleft inline-edit-private">
 							<input type="checkbox" name="keep_private" value="private" />
 							<span class="checkbox-title"><?php _e( 'Private' ); ?></span>