diff --git a/deployment/src/docker/maintenance.Dockerfile b/deployment/src/docker/maintenance.Dockerfile
index 1df6c551b..4ce817ae3 100644
--- a/deployment/src/docker/maintenance.Dockerfile
+++ b/deployment/src/docker/maintenance.Dockerfile
@@ -11,10 +11,17 @@ FROM $APP_IMAGE_CODE as code
 
 ARG CONFIGURATION=example
 
+COPY src/tools/ tools/
+
 # copy public constants into the Docker image to brand it
 COPY configurations/${CONFIGURATION}/branding/static/ static/
 COPY configurations/${CONFIGURATION}/branding/constants/ constants/
-COPY configurations/${CONFIGURATION}/branding/locales/ locales/
+COPY configurations/${CONFIGURATION}/branding/locales/*.json locales/tmp/
+# COPY configurations/${CONFIGURATION}/branding/locales/ locales/
+
+RUN apk add --no-cache bash jq
+
+RUN tools/merge-locales.sh
 
 ##################################################################################
 # BUILD ##########################################################################