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Add optional consumer-provided translations for shared debug, report, and welcome controls. Preserve canonical commands, categories, diagnostics, and copied content, with guarded English fallback for unavailable or invalid translations.
Validation: 107 library tests pass in both orders on Lua 5.1 and 5.2; all 24 vendor tests pass. Live client rendering remains separate validation.
QuestTogether 5.14.0 vendors this exact revision privately. Other consumers are unchanged.