Dutch pluralization

[R. Osinga]

Hi devs,

Since there os nu dutch pluralization in web2py yet and the admin page shows this kinda like a problem, I wanted to give you feeback on it.
Just copy the German de.py to nl.py and replace

# Plural-Forms for de (Deutsch)
nplurals=2  # German language has 2 forms:
            # 1 singular and 1 plural

with

# Plural-Forms for nl (Nederlands)
nplurals=2  # Dutch language has 2 forms:
            # 1 singular and 1 plural

and you're fine. The rest is identical.

Cheers,
Roald