Fix language variable in translation documentation - use al_user_language instead of al_interview_languages

[Copilot]

The "Ask the user a question" section in the translation documentation incorrectly used al_interview_languages instead of al_user_language for the field assignment in the YAML example.

The issue was in this code block:

id: language
question: |
    What language / que idioma?
fields:
    - Language/idioma: al_interview_languages  # ❌ Incorrect
      datatype: radio
      choices:
        - English: en
        - Español: es

This is incorrect because:

• al_interview_languages is a list of available language codes that the interview supports
• al_user_language is the variable that stores the user's currently selected language

The field should assign the user's choice to al_user_language:

id: language
question: |
    What language / que idioma?
fields:
    - Language/idioma: al_user_language  # ✅ Correct
      datatype: radio
      choices:
        - English: en
        - Español: es

This fix ensures that when developers implement the "Ask the user a question" pattern for language selection, the user's choice will be properly stored in the correct variable that the Assembly Line language system expects.

Fixes #518.

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[nonprofittechy]

It did the thing (and got updated pydoc-markdown too)