Added two missing dependencies

Author: mtiller

docker/PY/Dockerfile

@@ -17,6 +17,10 @@ RUN apt-get install -y python-pip
 RUN apt-get install -y python-scipy
 RUN apt-get install -y python-sphinx
 RUN apt-get install -y python-jinja2
+RUN apt-get install -y s3cmd
+
+# Install Sphinx internationalization stuff
+RUN pip install sphinx-intl
 
 # Finally, upgrade Pygments to the latest Modelica syntax rules
 RUN pip install --upgrade https://bitbucket.org/dietmarw/pygments-main/get/default.tar.gz