[Interest] Translating plural with is/are

[Jason H]

> 
> If you provide a translation file, the message with %n will be translated 
> according to the language's plural rules. For English, you'll have two 
> translations for the same source message.
> 
> 	"At least one upper case character is required" (a)
> 	"At least %n upper case characters are required" (b)
> 
> QTranslator takes care to apply the correct selection based on the number that 
> you passed.

Ok I'm getting there, but how do I specify this string (a) or that string (b)?
What's the qsTr() line look like?
qsTr( ? )