Add label for DELETE_MESSAGE, for conversation list context menu
Add label for DELETE_MESSAGE, for conversation list context menu

https://bugzilla.gnome.org/show_bug.cgi?id=746406

githubnemo/geary,githubnemo/geary,glebihan/geary,tshikaboom/geary,martinra/geary,tshikaboom/geary,emersion/geary,jimbonator/geary,jimbonator/geary,mjog/geary,AtticHacker/geary,aatishnn/geary,glebihan/geary,robol/geary,AtticHacker/geary,emersion/geary,martinra/geary,aatishnn/geary,mjog/geary,glebihan/geary,mjog/geary,emersion/geary,githubnemo/geary,martinra/geary,robol/geary,AtticHacker/geary,robol/geary,jimbonator/geary,aatishnn/geary,tshikaboom/geary