It often happens that banners are enabled in languages which have no translations, against the usage guidelines, and the fallback language is used automatically (usually English): this makes users riot.
Centralnotice admins are currently expected to manage the list of languages manually, adding each language only when ready. This means doubling the work around publishing of translations, so admins are lazy and just select all languages. Given they are humans and we can't just whip them endlessly, please make the interface easier.
Adding a checkbox to control whether a banner will be shown even in languages where no translation is available should be comparatively easy. Fallbacks should be disabled by default.