in your new Version 188.8.131.52 is no "Default datatable" !
But i need it !!
NEW version (from 184.108.40.206)
This function has been changed! As you can see on the current Changelog ("^ [#603]") now the datable template can be used when you create a new Layer.
Anyway the mentioned problem is just a language file related problem. We will publish the new German.lng in the current version as soon as it will be available from Mr. Stefan Lutz (http://www.toptec.ch). Till the next version of the German language file you need to change the language to English or add the new language variables to the German.lng (based on English.lng and the Changelog) to see the current language strings in German.