(legacy) backport show all help button behaviour to legacy code

src/www/head.inc

@@ -104,6 +104,20 @@ $pagetitle = gentitle( $pgtitle );
 				event.preventDefault();
 			});
 
+			// handle all help messages show/hide
+			$('[id*="show_all_help"]').click(function(event) {
+				$('[id*="show_all_help"]').toggleClass("fa-toggle-on fa-toggle-off");
+				$('[id*="show_all_help"]').toggleClass("text-success text-danger");
+				if ($('[id*="show_all_help"]').hasClass("fa-toggle-on")) {
+					$('[for*="help_for"]').addClass("show");
+					$('[for*="help_for"]').removeClass("hidden");
+				} else {
+					$('[for*="help_for"]').addClass("hidden");
+					$('[for*="help_for"]').removeClass("show");
+				}
+				event.preventDefault();
+			});
+
 		});
 		//]]>
 		</script>