Numbertext is an extension that transforms numbers into words.
Examples
Wiki default language
{{#numbertext:1700}}
{{#numbertext:1700}}
{{#moneytext:1700|USD}}
{{#moneytext:1700|USD}}
Note that moneytext is case-sensitive, {{#moneytext:1700|usd}} does not work.
Specifying language
{{#numbertext:1700|zh}}
{{#numbertext:1700|zh}}
{{#moneytext:1700|USD|zh}}
{{#moneytext:1700|USD|zh}}