data: Update several URLs

- Add contact, donation, cvs-browser URLs
- Update download and translate URLs
- Replace retired mailing list with discourse URL

README.md

@@ -8,8 +8,9 @@ The latest version of gitg is 44.
 
 - Website:      https://wiki.gnome.org/Apps/Gitg
 - Issues:       https://gitlab.gnome.org/GNOME/gitg/issues
-- Download:     http://download.gnome.org/sources/gitg/
-- Mailing list: http://mail.gnome.org/mailman/listinfo/gitg-list
+- Download:     https://download.gnome.org/sources/gitg/
+- Contact:      https://discourse.gnome.org/tag/gitg
+- Translate:    https://l10n.gnome.org/module/gitg/
 
 ## Installing gitg
 

data/org.gnome.gitg.appdata.xml.in.in

@@ -216,7 +216,9 @@
   <developer_name>The Gitg Team</developer_name>
   <url type="homepage">https://wiki.gnome.org/Apps/Gitg</url>
   <url type="bugtracker">https://gitlab.gnome.org/GNOME/gitg/issues</url>
-  <url type="donation">https://www.gnome.org/friends/</url>
-  <url type="translate">https://wiki.gnome.org/TranslationProject</url>
+  <url type="contact">https://discourse.gnome.org/tag/gitg</url>
+  <url type="donation">https://www.gnome.org/donate/</url>
+  <url type="vcs-browser">https://gitlab.gnome.org/GNOME/gitg</url>
+  <url type="translate">https://l10n.gnome.org/module/gitg/</url>
 </component>