Help with i18n language translation in template - strange behavior between Django 2.2.12 and 3.0+

[Александър Попов]

Hello guys, 

I hope you are doing well :)

I have the following problem in my project:

I have a simple PasswordChangeForm, which I want to translate in German for example... Everything is fine and works correctly in Django 2.2.12:
See: 1.png

If I upgrade my Django to v 3.0+ same labels are partially translated! And this behavior is only for some languages: de,ru,bg.
For example in 'fr' everything is fine and all labels and error messages are translated.

See: 2.png and 3.png

The code that I use is same. Only Django version is different.

My code in templates/passsword.html:

 <form method="POST" >

            {% csrf_token %}

            <fieldset class="form-group">

                <legend class="border-bottom mb-4">Password change</legend>

                {% load i18n %}

                {% language 'de' %}

                {{ p_form|crispy }}

                {% endlanguage %}

            </fieldset>

            <div class="form-group">

                <button class="btn btn-outline-info" type="submit" name="btn-change">Save</button>

            </div>

 </form>

Have you faced with issue liked this? Do you have any idea, what is wrong?

Thanks in advance.