Add support for babelfish package

[yowmamasita]

BabelFish is a Python library to work with countries and languages.

Package link: https://pypi.org/project/babelfish/

Source code: https://github.com/Diaoul/babelfish

Here's a preview of how it works:

>>> language = babelfish.Language('por', 'BR')
>>> language.alpha2
'pt'
>>> language.scope
'individual'
>>> language.type
'living'
>>> language.opensubtitles
'pob'
>>> babelfish.Language.fromalpha3b('fre')
<Language [fr]>

This is the error I get when I include babelfish sources in my worker code:

  File "/session/metadata/babelfish/__init__.py", line 14, in <module>
    from .converters import (LanguageConverter, LanguageReverseConverter, LanguageEquivalenceConverter, CountryConverter,
  File "/session/metadata/babelfish/converters/__init__.py", line 5, in <module>
    from pkg_resources import iter_entry_points, EntryPoint
ModuleNotFoundError: No module named 'pkg_resources'