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# Description of Changes ### Summary - Added support for configuring UI languages via `settings.yml` (`languages` field). - Modified `LanguageService` to respect the configured languages, while ensuring British English (`en_GB`) is always enabled. - Updated Thymeleaf templates to dynamically display only the allowed languages. - Improved logging and refactored some list-to-set conversions for better efficiency. ### Why the Change? - Allows administrators to limit available UI languages instead of displaying all detected languages. - Provides better customization options and simplifies language management. ### Challenges Encountered - Ensuring backwards compatibility: If `languages` is empty, all languages remain enabled. - Handling `Set<String>` instead of `List<String>` in `LanguageService` for optimized lookups. --- ## Checklist ### General - [x] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [x] I have read the [Stirling-PDF Developer Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md) (if applicable) - [x] I have read the [How to add new languages to Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md) (if applicable) - [x] I have performed a self-review of my own code - [x] My changes generate no new warnings ### Documentation - [ ] I have updated relevant docs on [Stirling-PDF's doc repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/) (if functionality has heavily changed) - [x] I have read the section [Add New Translation Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags) (for new translation tags only) ### UI Changes (if applicable) - [ ] Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR) ### Testing (if applicable) - [x] I have tested my changes locally. Refer to the [Testing Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing) for more details.