[kronolith] import Thunderbird Calendar with Kronolith

[Ferdinand Gruber]

I want to import Thunderbird Calendar data into Kronolith. I am sorry, I 
cannot find any menu item to import data - neither in Imp nor in Kronolith.
I use Horde 5.1.5 with Kronolith 3.1.4

Have I forgotten some configuration?

Please help me.

-- 
Greetings from Austria
Ferdinand Gruber