How can I add a name:en tag to the island of Sicily

[Vinzenz_Mai]

@ZeLonewolf

This type of edit is probably impossible to do in iD (the web-based editor).

It can be done in iD

@Chessel did everything that is needed, added a changeset comment, but received an error message instead. If I look at the edit numbers of @Chessel I rather think that it was a anti-vandalism rule not a problem of the editor.