add missing namespace

Author: pfefferle

includes/class-health-check.php

@@ -276,7 +276,7 @@ public static function get_author_posts_url( $author_id, $author_nicename = '' )
 	 */
 	public static function debug_information( $info ) {
 		$info['activitypub'] = array(
-			'label'  => __( 'ActivityPub' ),
+			'label'  => __( 'ActivityPub', 'activitypub' ),
 			'fields' => array(
 				'webfinger' => array(
 					'label'   => __( 'WebFinger Resource', 'activitypub' ),