在django中，Slug字段不适用于孟加拉语言。如何在孟加拉语中使用slug

from django.db import models
from django.utils.text import slugify
from django.utils.translation import ugettext_lazy as _

class BengaliSlugField(models.SlugField):
    def __init__(self, *args, **kwargs):
        kwargs['max_length'] = kwargs.get('max_length', 255)
        kwargs['unique'] = kwargs.get('unique', True)
        kwargs['blank'] = kwargs.get('blank', False)
        kwargs['null'] = kwargs.get('null', False)
        kwargs['verbose_name'] = kwargs.get('verbose_name', _('Slug'))
        super(BengaliSlugField, self).__init__(*args, **kwargs)

    def get_slugify_function(self):
        return slugify  # 可以根据需求选择其他slugify函数

    def pre_save(self, model_instance, add):
        value = getattr(model_instance, self.attname)
        if not value:
            raw_value = getattr(model_instance, self.slug_source)
            slug = self.get_slugify_function()(raw_value)
            setattr(model_instance, self.attname, slug)
            value = slug
        return value

from django.db import models
from .utils import BengaliSlugField

class MyModel(models.Model):
    title = models.CharField(max_length=100)
    slug = BengaliSlugField(slug_source='title')
    # 其他字段...