docs: add multilingual refusal messages documentation

[Pouyanpi]

Add documentation for (#1530) the multilingual refusal messages feature in content safety rails, including:

• Supported languages table with default messages
• Basic and advanced configuration examples
• Language detection behavior and accuracy benchmarks
• Cold start behavior and caching details
• Production considerations for container environments

[github-actions]

Documentation preview

https://nvidia-nemo.github.io/Guardrails/review/pr-1541

[greptile-apps]

Greptile Overview

Greptile Summary

Adds comprehensive documentation for a new multilingual refusal messages feature in content safety rails. The documentation includes:

• Supported languages table (9 languages with default refusal messages)
• Installation instructions via pip install nemoguardrails[multilingual]
• Basic and advanced YAML configuration examples
• Language detection behavior using the fast-langdetect library
• Cold start behavior and caching considerations
• Production deployment notes for containers

Key Concern: This documentation references code that does not yet exist in the codebase:

• The multilingual pip extra is not defined in pyproject.toml
• The detect_language action is not implemented
• No multilingual-related code exists in nemoguardrails/library/content_safety/

This PR appears to document PR #1530's feature before that PR has been merged. Ensure the feature implementation is merged first, or merge both PRs together.

Confidence Score: 3/5

• Documentation-only PR that is safe to merge, but references features not yet in the codebase which will cause user confusion.
• Score of 3 reflects that while this is a documentation-only change with no runtime risk, the installation instructions (pip install nemoguardrails[multilingual]) will fail because the extra is not defined. The documentation describes functionality that doesn't exist yet.
• The documentation file references nemoguardrails[multilingual] which doesn't exist. Coordinate with PR feat(content_safety): add support to auto select multilingual refusal bot messages #1530 for the feature implementation.

Important Files Changed

File Analysis

Filename	Score	Overview
docs/configure-rails/yaml-schema/guardrails-configuration/built-in-guardrails.md	3/5	Adds documentation for multilingual refusal messages feature with supported languages table, configuration examples, and cold start behavior. References pip install nemoguardrails[multilingual] extra that is not yet defined in pyproject.toml.

Sequence Diagram

sequenceDiagram
    participant User
    participant Config as config.yml
    participant NeMo as NeMo Guardrails
    participant LangDetect as fast-langdetect
    participant SafetyModel as Content Safety Model

    User->>NeMo: Send message (any language)
    NeMo->>Config: Check multilingual.enabled
    alt multilingual enabled
        NeMo->>LangDetect: detect_language(user_input)
        LangDetect-->>NeMo: language code (e.g., "es")
    end
    NeMo->>SafetyModel: content_safety_check_input
    SafetyModel-->>NeMo: {allowed: false, policy_violations: [...]}
    alt content blocked & multilingual enabled
        NeMo->>NeMo: Get refusal_message[detected_language]
        NeMo-->>User: Localized refusal message
    else content blocked & multilingual disabled
        NeMo-->>User: Default English refusal
    end

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[greptile-apps]

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