Rewrote define_dic_message_labels.
Rewrote define_dic_message_labels.


Former-commit-id: 52dfe152d5f1f2f9cd70d4a2bdac44d2dfbb0e60
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox