[Flow] default locale / i18n question

[Winfried Mingst]

Hello,

I would like to have german validation error messages.
Decimal input fields should display and accept the german decimal 
seperator ",".

I set default locale in my package's Settings.yaml:

TYPO3:
   Flow:
     i18n:
       defaultLocale: 'de'

But Messages are still in English and there are validation errors when 
enterig decimals like "12,20". Have I forgotten something?
I'm using "Flow 2.0 dev-master"

regards
Winfried