FEATURE: Localization fallbacks (server-side)

[ShashankFC]

Test 9

Summary by CodeRabbit

Release Notes

• Refactor

  • Restructured internationalization fallback system with optimized on-demand locale loading for improved efficiency.
  • Enhanced locale fallback resolution to intelligently cascade through requested language, site default, and English.
  • Consolidated locale initialization logic for better maintainability.

• Chore

  • Removed deprecated pluralization backend integration from environment configurations.

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Replicated from ai-code-review-evaluation/discourse-coderabbit#9

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EntelligenceAI PR Summary

This PR centralizes I18n locale fallback configuration into a dedicated initializer with a custom three-tier fallback strategy.

• Removed config.i18n.fallbacks = true from production, profile, and cloud66 environment files
• Created new config/initializers/i18n.rb with FallbackLocaleList class implementing user locale → site default → English fallback chain
• Removed standalone config/initializers/pluralization.rb (functionality consolidated)
• Added I18n.fallbacks.ensure_loaded! call in ApplicationController#set_locale method
• Extracted reusable ensure_loaded! method in TranslateAccelerator for explicit locale loading API
• Includes TODO for future language-specific fallback enhancements (e.g., Chinese variants)

[entelligence-ai-pr-reviews]

Walkthrough

This PR refactors I18n locale fallback configuration by centralizing it into a dedicated initializer. Previously, fallback settings were scattered across multiple environment files (production, profile) and the pluralization initializer. The new approach introduces a custom FallbackLocaleList class that implements a three-tier fallback strategy (user locale → site default → English) with an ensure_loaded! method for preloading locales. The ApplicationController now explicitly calls this method after locale determination, while the TranslateAccelerator gains a public ensure_loaded! method for reusable locale loading. This consolidation improves maintainability and provides better control over translation fallback behavior.

Changes

File(s)	Summary
config/cloud/cloud66/files/production.rb config/environments/production.rb config/environments/profile.rb	Removed I18n locale fallbacks configuration (config.i18n.fallbacks = true) from environment files, eliminating automatic fallback to default locale when translations are missing.
config/initializers/i18n.rb	Created new I18n initializer with custom FallbackLocaleList class implementing three-tier fallback strategy (user locale → site default → English) with ensure_loaded! method for preloading fallback locales.
config/initializers/pluralization.rb	Removed pluralization initializer that was configuring I18n's pluralization backend.
app/controllers/application_controller.rb	Added call to I18n.fallbacks.ensure_loaded! at end of set_locale method to ensure fallback locales are properly loaded after locale determination.
lib/freedom_patches/translate_accelerator.rb	Added public ensure_loaded! method to guarantee locale is loaded before use, initializing @loaded_locales and conditionally loading specified locale if not previously loaded.

Sequence Diagram

This diagram shows the interactions between components:

sequenceDiagram
    participant App as Application Code
    participant I18n as I18n System
    participant Fallbacks as I18n::Fallbacks
    participant SiteSetting as SiteSetting

    App->>SiteSetting: Get default_locale
    SiteSetting-->>App: Return locale value
    
    Note over App,Fallbacks: New: Ensure fallbacks are loaded
    App->>I18n: Access fallbacks
    I18n-->>App: Return Fallbacks instance
    App->>Fallbacks: ensure_loaded!
    activate Fallbacks
    Fallbacks->>Fallbacks: Load fallback configurations
    deactivate Fallbacks
    Fallbacks-->>App: Fallbacks ready
    
    Note over App: Continue with locale setup

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