How to combine FlatPages and Internationalization?

Question

Django

Good day.
I have a multilingual(2) Django-Oscar project. In it I need to add FlatPages. It is not a problem to add them, but when I change the language, the code of the selected language is not added to the static page url, respectively 404. In which direction should I dig?
Here is the form code for switching languages:

<form id="language_selector" class="navbar-left navbar-form" action="{% url 'set_language' %}" method="post">
  {% csrf_token %}
  <input name="next" type="hidden" value="{{ language_neutral_url_path }}" />
  {% for language in LANGUAGES %}
    <input type="radio" name="language" id="language_{{ language.0 }}" value="{{ language.0 }}" class="hide language-select-input">
    <label for="language_{{ language.0 }}" class="language-btn {% if language.0 == LANGUAGE_CODE%} selected link_site_style{% endif %}">
        <button type="button">{{ language.1 }}</button>
    </label>
  {% endfor %}
</form>

As far as I understood from the code, the prefixes for the language are given very deeply somewhere. But not to static pages.
I will be very grateful for your help.