German speaking countries constitute a well defined set of countries/language codes, which are geographically compact and have strong ties, no border controls. Accordingly, all but administrative and legal answers are usually applicable for a searcher from any of the countries.
I suggest including a regional setting, similar to the existing for the german speaking countries.
A possible key would be , which would be equivalen to .
While I personally mostly search in English, my wife uses German, and it's quite frustrating to either have to search three times separately (with regional setting "Austria", "Germany" and "Switzerland", or to possibly forgo best results.