added plural rules again

gluon/contrib/plural_rules/ja.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+# -*- coding: utf8 -*-
+# Plural-Forms for ja (Japanese)
+
+nplurals=1  # Japanese language has ONE form!
+
+# Always returns 0:
+get_plural_id = lambda n: 0
+
+# Construct and return plural form of *word* using
+# *plural_id* (which ALWAYS>0). This function will be executed
+# for words (or phrases) not found in plural_dict dictionary
+# construct_plural_form = lambda word, plural_id: word
+