I am totally lost in Google Analytics Content Grouping

Hi Guys,

I need help with Content Grouping. We have product profile pages on our site with similar structure like this:

Fruits:
- apple
- banana
- lemon

The fruit types has no different pages but their langauge versions have.

So I wanted to add a content group where the visits on different fruits can be shown:
- apple (what contains all apple pages in 13 languages)
- banana (what contains all banana pages in 13 languages)
- lemon (what contains all lemon pages in 13 languages)

As I understoo to see an Apple group in GA where all apple translation pages are shown, we should add this to those pages' GA code:

ga('set', 'contentGroup1', 'Apple');

But what should I add if I want to see the translatied pages' performance as well, so I want to see Apple - DE, Apple - FR statistics? It is called product group but I did not understood how to add this kind of code piece.

Thanks for your help!