diff --git a/compose-files/docker-compose.yml b/compose-files/docker-compose.yml
index 5622bd2..48a8e26 100644
--- a/compose-files/docker-compose.yml
+++ b/compose-files/docker-compose.yml
@@ -135,6 +135,9 @@ services:
       - SC_DOMAIN=localhost
       - SC_TITLE=HPI Schulcloud
       - SC_SHORT_TITLE=Schulcloud
+      - I18N__DEFAULT_LANGUAGE=de
+      - I18N__FALLBACK_LANGUAGE=de
+      - I18N__DEFAULT_TIMEZONE=Europe/Berlin
       # ENV new file service - please not no minio is deployed but env must be set, they are required
       - FILES_STORAGE__INCOMING_REQUEST_TIMEOUT=6000000
       - FILES_STORAGE__SERVICE_BASE_URL=http://localhost:4444