Internationalization (i18n)

There is a need to internationalize the lib.
has a proposal we can have a default internationalized strings/keys and give the developer the ability a flexibility to provide their own translation

### configuration
```js
var confere = new Confere({
locale: "en" // locale: "en_US",
i18n: { //custom translation (should override/merge the default)
en: {
name: "Name",
"required" : "${name} field is required"
},
//... other locales translations
}
//... other configuration options
})
```