added plural rules again

gluon/contrib/plural_rules/pl.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+# -*- coding: utf8 -*-
+# Plural-Forms for pl (Polish)
+
+nplurals=3 # Polish language has 3 forms:
+           # 1 singular and 2 plurals
+
+# 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: (0 if n==1 else
+                           1 if 2<=n<=4 else
+                           2)
+
+# 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')
+