There are some issues while Using DC on Tails but i found a workaround. Check this Forum Post. Having dedicated Packages or a Plugin for Pidgin Instant Messenger (which comes preinstalled with Tails) would be a lot nicer.
A dedicated DC-Debian package in the Synaptic/apt-get package Manager, so Tails’ Additional Software Feature would work as intended.
The only way to install DC on tails is through dpkg with the .deb package available on the official website
(which has a missing dependency: libappindicator 3-1)