Normalize locale handling and improve language picker UX#61
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nicpottier merged 4 commits intomainfrom Feb 17, 2026
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Add book_language field to AppConfig for explicit book content language (falls back to metadata auto-detection when unset). Redesign the LanguagePicker with two-phase autocomplete: type a language name, press space to lock it, then type a country to select a locale (e.g., en_US). Any language/country pairing is allowed with suggestions from a full countries list.
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This PR centralizes locale normalization and language context generation in the pipeline, then applies it across translation, quiz/glossary/caption prompts, packaging, preview, export, and step runners. It adds robust language fallback handling for legacy underscore locale keys and normalizes output language selection/deduping paths. The studio language UX is upgraded with a redesigned two-phase locale picker (language then country), richer display names, keyboard navigation, and an inline clear action for single-select fields. It also aligns v2 language help text with the Add Book flow and includes test updates for locale behavior.