Note that the description of the Lightning addon, as it appears in the
Add-ons Manager, has been modified to remove the explicit reference to
Thunderbird as it can be used with other programs as well
(specifically SeaMonkey, which intends to ship Lightning by default in
the future).
Due to the special nature of the ".description" property, the property
name cannot be changed without changing the UUID of the addon. Thus,
the modification will *not* show up on the l10n dashboard.