add locale for canvas

Dockerfile

 FROM centos:7
+
+RUN localedef -i en_DK -f UTF-8 en_DK.UTF-8 \
+ && echo "LANG=en_DK.UTF-8" > /etc/locale.conf \
+ && export LANG=en_DK.UTF-8
+
 RUN yum -y install epel-release
 RUN curl -sL https://rpm.nodesource.com/setup_12.x | bash -
 RUN yum -y update