resources.Language: embiggen language field

[jsnshrmn]

Description

Allows for longer autonomous in the language list

Rationale

fixes

 resources.Language.language: (fields.E009) 'max_length' is too small to fit the longest value in 'choices' (16 characters).
Error: Process completed with exit code 1.

Phabricator Ticket

N/A

How Has This Been Tested?

python manage.py migrate

Screenshots of your changes (if appropriate):

N/A

Types of changes

What types of changes does your code introduce? Add an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Minor change (fix a typo, add a translation tag, add section to README, etc.)

[suecarmol]

Thanks for the quick fix!