Open Suse 10.3

In the system tray I can change the date format to dd/mm/yyyy, That is normal for my country. But in Thunderbird I see the date of messages displayed in the American format. MM/DD/YYYY.

It seems that Thunderbird takes the information from the short format in the system. But it is correct.

And I cannot add any languages in the locale. Netherlands is selected, but only US English is available when I click "Add language".

Anyone encountered this problem?