Use en.errors.format "The default format to use in full error messages" (see https://github.com/rails/rails/blob/main/activemodel/lib/active_model/locale/en.yml) then you will get "%{attribute} %{message}" and use all the default Rails descriptions (which are pretty meaningful).
Use en.errors.format "The default format to use in full error messages" (see https://github.com/rails/rails/blob/main/activemodel/lib/active_model/locale/en.yml) then you will get "%{attribute} %{message}" and use all the default Rails descriptions (which are pretty meaningful).