How can I not write @entity.errors.add and still output the correct error messages from the locale?

Question

Ruby on Rails

My task is to display validation error messages in the form.
I can write my own error values ​​in the controller and model, then there are no problems.
For example: @entity.errors.add :email, t('mongoid.errors.models.modern.entity.attributes.email.invalid') gives the message from the locale, but also writes 'is valid' separated by a semicolon
I want do it via locale without duplication.
Instead of an active record in the locale, I have mongoid.
And if I write @entity.errors.add :email, :invali in the controller.
Then it complains that locale: en.mongoid.errors.models.modern/entity.attributes.email.invali is not present.
That's right, there is no such locale.
But there is locale en.mongoid.errors.models.modern/entity.attributes.email.invalid
And there is a value: 'Ivalid format email'.
But he already writes not this value, but the value 'is invalid', which does not match my custom value in the locale.
Good thing I shouldn't have the line @entity.errors.add :email, :invalid
Messages should be displayed in the view without these entries in the controller.
But for some reason they do not take those values ​​from the locale, but write 'is invalid'.
The locales and controller are in Engine Modern.
Question:
How can I not write @entity.errors.add with parameters and still print the correct error messages from the locale?
Yml is valid in locales
My guess is:
It might be Engine
It might be render action: :new