How to re-translate Django

Django Internals Internationalization
21

So I change it to this:

from django.apps import AppConfig
from django.utils.translation import gettext_lazy as _


class CoreConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'core'


class CustomFileBrowserConfig(AppConfig):
    name = 'filebrowser'
    verbose_name = _('File Browser')

This time no error but my translation is not showing up.