fix "no translation file found for domain" error
change translation domain to 'hydrilla-messages'
enable using with Python 3.7
move locales under builder/
expose the entire translation object instead of just its gettext method
internationalize using Babel
this commit also makes the sdist tarball generated by setuptools REUSE-compliant
include new schemas in package and in tests
facilitate for including other schemas in submodule and expose them to other packages