The options of the finance app in Windows 8 seem to determine the index shown on the main page and the timezone used to display the last refresh time on the live tiles of the watchlist. In the options of the app, a region/language can be selected, but
Germany isn't an option:
This feels kind of strange because the German stock index (DAX) is available for manual selection. So my questions is, whether the language selection in the options of the finance app is influenced by some system setting? My OS language is English, but all region/input settings are set to German.
Language settings (note that a language pack is available but not installed):