Usually, the default settings will be correct, but occasionally you may need to set things up differently.
'''Language:''' Normally, GRAMPS sets up languages and formats from system preferences (Language and Text on Snow Leopard and Lion; Internationalization International on Leopard). There are three main settings: On the first pane (LanguagesLanguage(s)) is a list of languages. GRAMPS will go down the list and select the first one for which it has a translation to select the language in which all menus, labels, and messages are presented. On the right side of that pane at the bottom is an "Order for Sorted Listssorted lists" listbox which sets the way that lists are alphabetically sorted. Finally, in the third pane (second pane in Leopard) (Formats) one can select a country /Region which determines things like month and day names, whether a comma, dot, or space is used to separate thousands or decimal fractions, and so on.
If you want to run GRAMPS with different language or locale settings than you use for your system settings, you can use the "defaults" program from Terminal.app (Applications:Utilities:Terminal.app):
defaults write -app Gramps AppleLocale "de_DE"
defaults write -app Gramps AppleCollationOrder "de"
AppleLanguages corresponds to the language list, AppleLocale to the Format country/Region, and AppleCollationOrder selects the way that lists are sorted. You need not set them all.
To remove the special settings