Install the locales package for the release linux image.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

Makefile

@@ -186,12 +186,13 @@ release-test-via-docker-ubuntu:
 
 release-via-docker-ubuntu:
 	docker run --rm --name mayan_release -v $(HOME):/host_home:ro -v `pwd`:/host_source -w /source ubuntu:16.04 /bin/bash -c "\
+	apt-get update && \
+	apt-get -y install locales && \
 	echo "LC_ALL=\"en_US.UTF-8\"" >> /etc/default/locale && \
 	locale-gen en_US.UTF-8 && \
 	update-locale LANG=en_US.UTF-8 && \
 	export LC_ALL=en_US.UTF-8 && \
 	cp -r /host_source/* . && \
-	apt-get update && \
 	apt-get install make python-pip -y && \
 	pip install -r requirements/build.txt && \
 	cp -r /host_home/.pypirc ~/.pypirc && \