Maybe I’m not in one of the Experimental content localization allowed groups and the icon is just visible for some reason. 
Though saying that, enabling experimental_content_localization on my test site has not popped the icon in my post menu. I may need to wait for more detailed instructions. 
Edit:
Ahhh, I had to add the addTranslation option to my post menu setting myself. Now it shows up and I can click on it and see the options. 