The cows lists can now run on the latest mycroft-core dev branch (18.2.6b I think), on Python3.
The python 2 version is waiting for a PR on mycroft-skills branch 18.02.
Unfortunately the updated skill is not backward compatible, hence the two versions.
If you can’t wait for the PR to be accepted, and you can live with the risk, I have included instructions on installing directly from my GitHub in the README.
And the bug fix: Non english characters in lists and tasks will not cause an error anymore, in the Python 3 version.