[FIX] Odoo 11.0: add a locale to prevent ascii decode errors

Closes odoo#129

11.0/Dockerfile

@@ -1,6 +1,15 @@
 FROM debian:stretch
 MAINTAINER Odoo S.A. <[email protected]>
 
+# Generate locale C.UTF-8 for postgres and general locale data
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt-get update -qq && apt-get install -y locales -qq
+RUN echo 'C.UTF-8 UTF-8' >> /etc/locale.gen && locale-gen
+RUN dpkg-reconfigure locales && /usr/sbin/update-locale LANG=C.UTF-8
+ENV LANG C.UTF-8
+ENV LANGUAGE C.UTF-8
+ENV LC_ALL C.UTF-8
+
 # Install some deps, lessc and less-plugin-clean-css, and wkhtmltopdf
 RUN set -x; \
         apt-get update \