diff --git a/Dockerfile b/Dockerfile
index c7c2249c..d7c914ee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,14 @@
 FROM python:3.6-slim-stretch
 
 
+LABEL maintainer="inf_sfb1288@lists.uni-bielefeld.de"
+
+
 ENV FLASK_APP=nopaque.py
+ENV LANG=C.UTF-8
+
+
+EXPOSE 5000
 
 
 RUN apt-get update \
@@ -27,7 +34,6 @@ RUN python -m venv venv \
  && mkdir logs
 
 
-EXPOSE 5000
 VOLUME ["/home/nopaque/logs", "/home/nopaque/migrations"]