When editing using the Design Studio it only allows editing in the default language. 

In sites with multiple languages designed to use many snippets for localization content editors must use the Portal Management app to edit snippets out of context from the pages they occur on. 

It would be beneficial to be able to toggle the language of the portal in the designer to allow a preview of the content in said language and the ability to edit page copy and snippets in place. 

I don't know how Design Studio was released without the ability to choose the editing language.

Credit to Eric Sutter who first posted this 9 months ago in Power Pages Ideas Forum, which seems Microsoft does not monitor.