base: Install `locales-all`

The `parametertreelocaletest` test requires a locale that uses a comma
instead of a dot as the decimal seperator.

Bug: https://github.com/aburch/dune-docker/issues/1

base-8/Dockerfile

@@ -25,6 +25,7 @@ RUN apt-get update && apt-get dist-upgrade --no-install-recommends --yes \
   libltdl-dev \
   libtinyxml2-dev \
   libtool \
+  locales-all \
   mpi-default-bin \
   mpi-default-dev \
   openssh-client \

base-9/Dockerfile

@@ -25,6 +25,7 @@ RUN apt-get update && apt-get dist-upgrade --no-install-recommends --yes \
   libltdl-dev \
   libtinyxml2-dev \
   libtool \
+  locales-all \
   mpi-default-bin \
   mpi-default-dev \
   openssh-client \