Constable
Thanks for your answer. Mapsme provides you a map which is the openstreetmap.org map, and then when you edit it you're editing openstreetmap.org . Here is the bar you added http://www.openstreetmap.org/node/5100424921. On the left you can see the tags that you added to it.
I'm going to add the name=Lighthouse tag as name:en=Lighthouse should mean the English translation of the Italian name.
Cheers