Replace the Claws Mail launcher by Icedove
Originally created by @sajolida on #10739 (Redmine)
To mark the deprecation of Claws Mail in 1.8 we should replace the top bar launcher with the one of Icedove.
Feature Branch: kytv/feature/10739-add-icedove-to-launcher
Parent Task: #5663 (closed)
Edited by sajolida