As administrator, I went to the User Management section.
I chose "Edit" the profile of an user and I select its "Notifications" tab
As you can see from the image I reported below, I added by hands inside a red rectangle the content of the variable:
$hesklang['nomw']='Helpdesk send me a notification via email when:';
which in normal conditions and using at least two different color schemas (blue and black) does not appear.
Topoldo/Leopoldo