diff --git a/README.md b/README.md
index c459bfdb4..e857e1cf5 100644
--- a/README.md
+++ b/README.md
@@ -42,9 +42,21 @@ $ docker run -d \
 The following environment variables are also honored for configuring your UXBOX instance:
 
 #### Frontend
--	`-e API_URL=...` (defaults to http://127.0.0.1:6060/api. **Only available at build time!**
+
+**Only available at build time!**
+-	`-e UXBOX_CONFIG_URL=...` (defaults to http://127.0.0.1:6060/api)
+-	`-e UXBOX_DEMO=...` (defaults to false)
+-	`-e UXBOX_DEBUG=...` (defaults to false)
+
+Available at runtime:
+-	`-e LANG=...` (defaults to en_US.UTF-8)
+-	`-e LC_ALL=...` (defaults to C.UTF-8)
 
 #### Backend
+
+Available at runtime:
+-	`-e LANG=...` (defaults to en_US.UTF-8)
+-	`-e LC_ALL=...` (defaults to C.UTF-8)
 -	`-e UXBOX_HTTP_SERVER_DEBUG=...` (defaults to false)
 -	`-e UXBOX_MEDIA_URI=...` (defaults to http://localhost:6060/media/)
 -	`-e UXBOX_MEDIA_DIRECTORY=...` (defaults to resources/public/media)
diff --git a/backend/Dockerfile b/backend/Dockerfile
index 380c02290..8f675a121 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -20,7 +20,9 @@ LABEL maintainer="mathieu.brunot at monogramm dot io"
 COPY --from=0 /home/uxbox/backend/dist/uxbox-backend.jar /srv/uxbox/app.jar
 COPY --from=0 /home/uxbox/backend/docker-entrypoint.sh /entrypoint.sh
 
-ENV UXBOX_HTTP_SERVER_DEBUG=false \
+ENV LANG=en_US.UTF-8 \
+    LC_ALL=C.UTF-8 \
+    UXBOX_HTTP_SERVER_DEBUG=false \
     UXBOX_MEDIA_URI="http://localhost:6060/media/" \
     UXBOX_MEDIA_DIRECTORY="resources/public/media" \
     UXBOX_ASSETS_URI="http://localhost:6060/static/" \
diff --git a/docker/Dockerfile b/docker/Dockerfile
index bbc49851f..e325709aa 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -38,11 +38,10 @@ RUN set -ex; \
     cd .. && \
     rm -rf ./imagemagick
 
-ENV NODE_VERSION=8.15.0
-
-ENV LANG en_US.UTF-8
-ENV LC_ALL C.UTF-8
-ENV API_URL https://demo.uxbox.io/api
+ENV NODE_VERSION=8.15.0 \
+    LANG=en_US.UTF-8 \
+    LC_ALL=C.UTF-8 \
+    UXBOX_CONFIG_URL="/api"
 
 RUN set -ex; \
 	echo "deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg main" >> /etc/apt/sources.list; \
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 29fdc3c73..90323c906 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -1,8 +1,9 @@
 FROM monogramm/docker-uxbox-builder:latest
 
 ENV LEIN_ROOT=TRUE \
-    API_URL=http://127.0.0.1:6060/api \
-    IS_DEMO=false
+    UXBOX_CONFIG_URL="/api" \
+    UXBOX_DEMO=false \
+    UXBOX_DEBUG=false
 
 # Copy frontend source and build release
 COPY . /home/uxbox/frontend
@@ -11,8 +12,11 @@ RUN set -ex; \
     rm -f Dockerfile; \
     rm -rf ./dist ./node_modules; \
     sed -i \
-        -e 's|"uxbox.config.url" ".*"|"uxbox.config.url" "${API_URL}/api"|g' \
+        -e 's|"uxbox.config.url" ".*"|"uxbox.config.url" "${UXBOX_CONFIG_URL}"|g' \
         scripts/figwheel.clj; \
+    sed -i \
+        -e 's|url ".*")|url "${UXBOX_CONFIG_URL}")|g' \
+        src/uxbox/config.cljs; \
     npm install; \
     npm run prod; \
     bash -c "/home/uxbox/frontend/scripts/dist-main"; \
@@ -26,6 +30,9 @@ FROM nginx:alpine
 
 LABEL maintainer="mathieu.brunot at monogramm dot io"
 
+ENV LANG=en_US.UTF-8 \
+    LC_ALL=C.UTF-8
+
 # Copy built app to www root
 COPY --from=0 /home/uxbox/frontend/dist /usr/share/nginx/html