+%package addon-lightning
+Summary: An integrated calendar for Icedove
+Summary(pl.UTF-8): Zintegrowany kalendarz dla Icedove
+License: MPL 1.1 or GPL v2+ or LGPL v2.1+
+Group: Applications/Networking
+Requires: %{name} = %{version}-%{release}
+
+%description addon-lightning
+Lightning is an calendar extension to Icedove email client.
+
+%description addon-lightning -l pl.UTF-8
+Lightning to rozszerzenie do klienta poczty Icedove dodające
+funkcjonalność kalendarza.
+