Provided text for a button tooltip

locale/en_US/messages.php

@@ -89,6 +89,8 @@ return [
         'JOIN_REQUEST' => [
             'SUBMIT_SUCCESSFUL'         => 'Request to join organisation <strong>{{name}}</strong> sent',
 
+            'REQUEST'                   => 'Request to join organisation',
+
             'CANCEL'                    => 'Cancel request to join organisation',
             'CANCEL_CONFIRM'            => 'Are you sure you want to cancel your request to join the organisation <strong>{{name}}</strong>?',
             'CANCEL_YES'                => 'Yes, cancel request',