Administration: Capitalize "Collapse Menu" string for better consiste…

…ncy.

This changeset brings more consistency by capitalizing the "Collapse Menu" string localted in the main admin menu.

Props alireyad, bijit027, amimulihsanmahdi, csesumonpro.
Fixes #59133.



git-svn-id: https://develop.svn.wordpress.org/trunk@59847 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/menu-header.php

@@ -284,7 +284,7 @@ function _wp_menu_output( $menu, $submenu, $submenu_as_parent = true ) {
 	echo '<li id="collapse-menu" class="hide-if-no-js">' .
 		'<button type="button" id="collapse-button" aria-label="' . esc_attr__( 'Collapse Main menu' ) . '" aria-expanded="true">' .
 		'<span class="collapse-button-icon" aria-hidden="true"></span>' .
-		'<span class="collapse-button-label">' . __( 'Collapse menu' ) . '</span>' .
+		'<span class="collapse-button-label">' . __( 'Collapse Menu' ) . '</span>' .
 		'</button></li>';
 }