The set of 6 stamps has been announced with the First Day Sheet describing the issue of these stamps.

Since the international happening, the first day sheets were issued in four languages: French, Dutch, English and German.

Here below you can notice the French, English and German First Day Sheet (Dutch version still missing):

Scan of the internal of the First Day Sheet: 

There have been two different sets of the French version at least. Below you can see the differences in the word "presente" of the French version: