cldr-plurals

CLDR.js

CLDR.js provides logic from the
Unicode Common Locale Data Repository.
Currently, the only functionality it provides is the
pluralization rules.

$3

Usage:

CLDR.pluralForm(0, 'en'); // => 'other'
CLDR.pluralForm(1, 'en-US'); // => 'one'
CLDR.pluralForm(2.383, 'fr'); // => 'other'
CLDR.pluralForm(1, 'zh'); // => 'other'
CLDR.pluralForm(26, 'uk'); // => 'many'

If you set CLDR.defaultLanguage then the second argument is optional:

CLDR.defaultLanguage = 'pl';
CLDR.pluralForm(22); // => 'few'

Though CLDR.js doens't provide an I18n framework, you can use this
logic as part of yours. For example, you might write the following:

CLDR.defaultLanguage = 'en';

var translations = {
'en': {
'widget': {
'one': 'one widget',
'other': '{{count}} widgets'
}
},
'jp': {
'widget': {
'other': '{{count}} ウィジェット'
}
}
};

function pluralize(key, count, language) {
var form = CLDR.pluralForm(count),
language = language || CLDR.defaultLanguage;
return translations[language][key][form];
}