I can't read czech so I don't know what's in store in that site.
On the main
www.singaporeair.com, no link is provided under the drop down country site option for the czech version.
Similarily, there is such thing as
http://www.singaporeair.ru/singaporeair_ru/index.html with russian text on it. And just like the czech version, there is no link provided by SIA's main site to direct it to this site.
Now this has me guessing. But with Eastern Europe having been opened for more than a decade, makes sense for SQ to market there albeit they still haven't introduced any passenger services from those nations.