Sassy Social Share is 100% compatible with WPML. Following are the steps to install and configure both these plugins together.

Getting started and WPML’s set-up wizard

• Install and activate Sassy Social Share plugin from the Plugins > Add New section in the admin area of your website.
• Install and configure WPML plugin as described here
  

WPML translation tools

The title displayed above the icons, translatable text in the options and text of the widgets (configurable from the Appearance > Widgets section in the admin panel) can be translated via String Translation Module. All the text of the Sassy Social Share plugin except this can be translated as described at the link in the beginning of this article.