Hello,
It’s related with your WP version. You are using 4.0 and WPLANG to ‘de_DE’ is deprecated (https://core.trac.wordpress.org/changeset/29630). Use $locale=’de_DE’; https://www.8theme.com/demo/docs/royal/index.html#!/how_to_translate Check now your site.
Regards, Olga Barlow
