Add Thunderbird Cardbook config informations

[m4dz]

Cardbook is the new way to access carddav address book inside Thunderbird in a dedicated module.

It's way more stable than the Sogo Connector, so adding informations in the Sync app index to configure Cardbook can be a good choice.

[clochix]

I like this idea. Configuring Cardbook require the same informations as Sogo, so I just added its name. Unfortunately, this are translated strings, so I can't add a link to the addon page.

[frankrousseau]

If someone does that, it would be nice to inform that iOS information work on OSX too.

[clochix]

Done ;-)

[frankrousseau]

Thx

[poupotte]

Thanks @m4dz and @clochix