Fixed #25468 -- Made DjangoJSONEncoder lazy string aware

Thanks Stavros Korokithakis for the report and Tim Graham for the
review.

docs/releases/1.10.txt

@@ -162,6 +162,12 @@ Requests and Responses
 
 * ...
 
+Serialization
+^^^^^^^^^^^^^
+
+* The ``django.core.serializers.json.DjangoJSONEncoder`` now knows how to
+  serialize lazy strings, typically used for translatable content.
+
 Signals
 ^^^^^^^