Restore LocalizedModel to its former glory as an convient way to get all the mixins

localized_fields/models.py

@@ -1,21 +1,16 @@
-from django.db import models
-from django.core.checks import Warning
+from psqlextra.models import PostgresModel
+
+from .mixins import AtomicSlugRetryMixin
 
 
-class LocalizedModel(models.Model):
-    """A model keeped for backwards compatibility"""
+class LocalizedModel(AtomicSlugRetryMixin, PostgresModel):
+    """Turns a model into a model that contains LocalizedField's.
 
-    @classmethod
-    def check(cls, **kwargs):
-        errors = super().check(**kwargs)
-        errors.append(
-            Warning(
-                'localized_fields.LocalizedModel is deprecated',
-                hint='There is no need to use localized_fields.LocalizedModel',
-                obj=cls
-            )
-        )
-        return errors
+    For basic localisation functionality, it isn't needed to inherit
+    from LocalizedModel. However, for certain features, this is required.
+
+    It is definitely needed for :see:LocalizedUniqueSlugField, unless you
+    manually inherit from AtomicSlugRetryMixin."""
 
     class Meta:
         abstract = True