Expanded and reorganized language keys in en.json, including improved labels for language selection, about dialog, and time range features. Added missing Portuguese language entry to es.json for consistency. Updated descriptions and placeholders for better clarity and user experience.
Introduces English and Spanish translation files, integrates localization throughout dialogs, and adds a language selection tab to the custom options dialog. UI strings are now loaded via the localization manager, enabling dynamic language switching and improved internationalization.
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