Remove i18n from developer error message

Fixes #6, props @grappler

class-gamajo-dashboard-glancer.php

@@ -51,7 +51,7 @@ public function __construct() {
 	public function add( $post_types, $statuses = 'publish' ) {
 		// If relevant output action hook has already passed, then no point in proceeding.
 		if ( did_action( 'dashboard_glance_items' ) ) {
-			_doing_it_wrong( __CLASS__, __( 'Trying to add At a Glance items to dashboard widget afterhook already fired', 'gamajo-dashboard-glancer' ), '1.0.0' );
+			_doing_it_wrong( __CLASS__, 'Trying to add At a Glance items to dashboard widget afterhook already fired', '1.0.0' );
 			return;
 		}