Monster languages should be NamedAPIResource

The key "languages" is inconsistent across the API and so either the monster languages should be NamedAPIResources or perhaps changed to a different key (maybe "communication").

Look at the monster data structure in the API to find the 'languages' key. Compare it with other keys that are NamedAPIResource types. Determine if the fix is to change the type to NamedAPIResource or rename the key to something like 'communication'. Check existing tests for monster data to understand the expected format.

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