The situation
Unfortunately, Buttonizer is currently not compatible with multi language plugins such as WPML.
However, we have a premium only feature called Page Rules.
With Page Rules, you can make buttons appear/hide on certain pages.
For example, you can make an English button only appear on your English site.
In here, we will show you how you can use Page Rules to simulate a multi language button.
Setup
First, you'll need to have a multi language plugin that adds a language code in the permalink.
For example:
www.yourdomain.com/fr/page
or
www.yourdomain.com/page?lang=fr
Then create Buttonizer buttons for each of the languages.
( You can use duplicate button/group )
Page Rules
Now we will make the buttons only appear on certain languages.
Go to the Visibility page of the button or group.
Under Page Rules, click on Add Page Rule.
Create your rule. My language code is always on the beginning of the permalink.
So I choose Path begins with and set the value to /fr/.
After creating your Page Rule, your button/group should now only appear on pages with the set rule.
For me, it will only show on pages with /fr/ on the beginning of the permalink.