Merge pull request #756 from kalxas/master

compiled po messages
Removed some icons I previously added in the wrong place.
importlayers now display a message to the user when stopping the process because --overwrite was not set and a layer with this name already exists
Merge pull request #760 from capooti/importlayers

importlayers raises a message when skipping importing an existing layer and the --overwrite option was not specified