Hydrilla

incorporate version 2 of Hydrilla JSON schemas

update schema versions to 1.0.1

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