In the German UI, the thousands separator "," is used. In Germany, we use "."
(and "," for the decimal separator). If you use the ' printf(3)/sprintf(3) flag,
all should be fine in all translations. Of course you can also use localeconv(3)
to get out the thousands separator.

Reproducible: Always
Steps to Reproduce:
1. 
2. 
3. 

Actual Results:  
, is the thousands separator.

Expected Results:  
. is the thousands separator.

[~] $ locale
LANG=de_DE@euro
LC_CTYPE="de_DE@euro"
LC_NUMERIC="de_DE@euro"
LC_TIME="de_DE@euro"
LC_COLLATE="de_DE@euro"
LC_MONETARY="de_DE@euro"
LC_MESSAGES="de_DE@euro"
LC_PAPER="de_DE@euro"
LC_NAME="de_DE@euro"
LC_ADDRESS="de_DE@euro"
LC_TELEPHONE="de_DE@euro"
LC_MEASUREMENT="de_DE@euro"
LC_IDENTIFICATION="de_DE@euro"
LC_ALL=