Add I18N for the module

[mdc-webdb]

Python itself has an working implementation, but this must also be done on the module.
I don't think submitting it as a PR would be expedient, as the development of the module is too fast. You wouldn't be able to keep up with updating the PR. It would be better to consider it in general.
Python documentation for it:
https://docs.python.org/3/library/gettext.html
Creating the translations itself will be easy I think.