Set new Admin language as default

[Ahler]

Hello,

 

how can i set a new language to default in the Admin-section?

 

At the moment i have german admin-section but i want to change to a dutch admin admin-section.

 

i have installed the dutch-language-pack for catalog and admin. In the catalg-section i set dutch as default-language and it will works, but in the admin-section it is still german.

 

How to handle this problem?

 

THX