Available languages bar

Maven does not include an easy way to integrate the different translated sites.
I propose to have a bar showing the available languages. Something similar to the attached image.
I did it manually, however it should exist an automatic option, that takes the locales from the POM.

<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.0-beta-3</version>
<configuration>
<locales>en,fr,es</locales>

The link to each language could be the index.html, and not the corresponding page in other language, because sites in different languages could be different (different version, different pages, etc), at least the index.html is the entry point.