For 1.0.1, look for the following line in wp-admin/options-permalink.php:
$catmatch = $front . 'category/';
Change category to kategorie.
In nightly builds, the rewrite rules have moved to the rewrite_rules() function in wp-include/functions.php.
Oops. You also need to change get_category_link() in template-functions-category.php. Change this line:
$link = get_settings('siteurl') . $front . 'category/';
I'm trying to do the same think for the last version of WP 1.5.2.
Is there someone that knows what i have/where i have to change(the file), so i can translate /category/ into something else like /categorie/ (in my language).
also - expecting, if possible, some replys here: