https://github.com/activerecord-hackery/ransack/blob/9c66f49fc1be1a570d7b5ff1768b0bbc4a4f4524/lib/ransack/translate.rb#L14-L16

      def predicate(key, options = {})
        I18n.translate(:"ransack.predicates.#{key}", default: key.to_s)
      end

This can be:

• A leftover of Remove custom Ransack predicates that were MetaSearch backports #8010;
• The intent was to provide a custom scope, like active_admin.ransack, and fallback on the original translation

@javierjulio I have a working implementation of the latter at 3e11e2c, but I'm not sure that this is the correct direction

If we don't want this complexity, I would rather delegate everything to Ransack and simplify the code