Add support for pluralization locales in component interpolation

In order to avoid having to add markup to translations it would be helpful if component interpolation would also work for pluralization locales.

const messages = {
  en: {
    comments: 'No comments | {n} comment | {n} comments'
  }
}

<i18n path="comments" tag="p">
  <b place="n">{{ comments.length }}</b>
</i18n>

[ymhr]

What about an alternative implementation like:

<i18n path="some.path" :plural="3" />

It feels weird that there’s some significant functionality in this library that you can’t use if you’re using the <i18n /> tag, unless I am missing something?

[mariomka]

Something new? It will be so useful.