-<p><label for="trackback_url"><?php _e('Send trackbacks to:'); ?></label> <?php echo $form_trackback; ?><br /> (<?php _e('Separate multiple URLs with spaces'); ?>)</p>
-<p><?php _e('Trackbacks are a way to notify legacy blog systems that you’ve linked to them. If you link other WordPress sites, they’ll be notified automatically using <a href="https://codex.wordpress.org/Introduction_to_Blogging#Managing_Comments" target="_blank">pingbacks</a>, no other action necessary.'); ?></p>
+<p>
+ <label for="trackback_url"><?php _e( 'Send trackbacks to:' ); ?></label>
+ <?php echo $form_trackback; ?>
+</p>
+<p id="trackback-url-desc" class="howto"><?php _e( 'Separate multiple URLs with spaces' ); ?></p>
+<p><?php
+ printf(
+ /* translators: %s: Codex URL */
+ __( 'Trackbacks are a way to notify legacy blog systems that you’ve linked to them. If you link other WordPress sites, they’ll be notified automatically using <a href="%s">pingbacks</a>, no other action necessary.' ),
+ __( 'https://codex.wordpress.org/Introduction_to_Blogging#Managing_Comments' )
+ );
+?></p>