Filter By Languages Not Working

[DanielJDufour]

Describe the bug
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To Reproduce
Steps to reproduce the behavior:

1. Go to https://api.code.gov/repos?api_key=DEMO_KEY&languages=Python

Expected behavior
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It should only return the repositories that are in Python

Screenshots
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Additional context
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This is important because we want to do server-side filtering in the browse projects page.