-Set problems style (maybe will fix strange flashing bug?)
-global lang cookie, + display (remember in each variant what is shown...)
-translations (how ? switch on index page only, then find ideas...)
-Improve style for various screen sizes
+Checkered1 & 2 --> avec switch, coup roi sur roi.
+Chakart
+
+Add problems
+https://www.janko.at/Retros/Glossary/Dynamo.htm
+https://www.janko.at/Retros/Problemkiste/N1995-04.htm#3718