added nl, es plural rules, thanks Vladyslav

gluon/contrib/plural_rules/nl.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+# -*- coding: utf8 -*-
+# Plural-Forms for nl (Dutch (Netherlands))
+
+nplurals=2  # Dutch has 2 forms:
+            # 1 singular and 1 plural
+
+# Determine plural_id for number *n* as sequence of positive
+# integers: 0,1,...
+# NOTE! For singular form ALWAYS return plural_id = 0
+get_plural_id = lambda n: int(n != 1)
+
+# 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 + 'suffix')
+