In the meantime I studied the code fragments which bear the various expressions to be translated. I hope I found universally usable translations.
So I provide a dede2.tr file to anybody who might be interested.
But a warning word might be appropriate:
At least as far as "my" dede2.tr file is concerned it can only yield "raw" translations. In any case the translation has to be polished "by hand" if it is to be used in production code.