Addons page: italian localization for Mozilla links

[Christophe Jarry]

Dear developers,

Today I browsed your page listing free software addons at
http://www.gnu.org/software/gnuzilla/addons.html.

It appears that a lot of links to Mozilla's addons page redirect to
web pages in italian. For instance, "Add Bookmark Here 2" addon has the
url "https://addons.mozilla.org/it/firefox/addon/3880"; instead of
"https://addons.mozilla.org/en-us/firefox/addon/3880";.

I think it would be good to make all those pages available in english
only, so that most of GNUzilla users can understand the addon
description on its Mozilla page.

Christophe