Ordinal of zero in Dutch

[KommuSoft]

Expected Behaviour

The ordinal value for Dutch for zero is:

>>> num2words(0, to='ordinal', lang='nl')
'nule'

Actual Behaviour

In Dutch this would likely be: nulde or nulste. Wiktionary says it is nulde.

or we should raise an error to disable values less than or equal to 0.

Steps to reproduce

• num2words(0, to='ordinal', lang='nl')