The bot's locales/*.json files do not contain the webapp-specific keys
(connect, extend_subscription, loading, etc.), so applyI18n was
overwriting the localized HTML defaults with raw key names.
Merge the bundled FALLBACK_I18N table with whatever the server provides
per language, letting server values override but falling back to the
in-bundle translations for keys the bot does not ship.
3252a8
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