The Article suggestions feature was deployed on the Portuguese Wikipedia.
"<cx-translation-filter-suggested-translations>", which as a new message key that this feature adds, is shown instead of the actual message on Special:ContentTranslation in production.
See https://pt.wikipedia.org/wiki/Especial:ContentTranslation to see it (you need to log and enable the ContentTranslation beta feature).
@Nikerabbit says that it has something to do with RL cache.