AMP WPML - WordPress Plugin
WPML is a popular multi-lingual plugin which allows you to setup localization. It creates different versions of the website for every language.
Plugin Features
WPML for AMP is a compatibility extension which integrates easily with your WPML setup and generates the correct AMP version of it. It will recognize your existing langauge setup and generates perfect AMP version of it. There are no clunky options to play with. Once you activate this extension, it will automatically add the AMP compatibility.