install relevant locales in Dockerfile

Dockerfile

@@ -1,38 +1,50 @@
 from debian:stable
 
+###
+# install dependencies
 RUN apt update
 RUN apt install --no-install-recommends --assume-yes \
-    gettext-base \
+    locales \
+    gettext \
     man-db \
     psmisc \
-    nano tree \
+    nano \
+    tree \
     bsdmainutils \
     x11-apps
- RUN rm -rf /var/lib/apt/lists/*
+RUN apt clean
+RUN rm -rf /var/lib/apt/lists/*
 
-## Set user and group
+###
+# install locales and set default
+RUN sed -i 's/^# *\(en_US.UTF-8\)/\1/' /etc/locale.gen
+RUN sed -i 's/^# *\(fr_FR.UTF-8\)/\1/' /etc/locale.gen
+RUN locale-gen
+RUN update-locale LANG=en_US.UTF-8
+ENV LANG en_US.UTF-8
+
+###
+# set user and group
 ARG user=gsh-user
 ARG group=gsh-user
 ARG uid=1000
 ARG gid=1000
 RUN groupadd -g ${gid} ${group}
 RUN useradd -u ${uid} -g ${group} -s /bin/sh -m ${user} # <--- the '-m' create a user home directory
 
-## Switch to user
+###
+# switch to user
 USER ${uid}:${gid}
-
 WORKDIR /home/${user}
 
-## use the latest github version
-# ADD --chown=gsh-user:gsh-user https://api.github.com/repos/phyver/GameShell/tarball GameShell.tgz
-# RUN mkdir GameShell
-# RUN tar -xzf GameShell.tgz -C GameShell --strip-components 1
-# RUN rm -f GameShell.tgz
-# RUN GameShell/bin/archive.sh
-# RUN rm -rf GameShell
 
-## if you want to copy a local, customized version, comment the preceeding
-## lines and uncomment the next one
-COPY GameShell.sh .
+### use the latest github version
+ADD --chown=gsh-user:gsh-user https://github.com/phyver/GameShell/releases/download/latest/gameshell.sh gameshell.sh
+
+### if you prefer to use a local customized version, comment the preceeding
+### ADD ...
+### line and uncomment the next one
+### (NOTE that you need to have generated a "gameshell.sh" file with GSH_ROOT/utils/archive.sh
+# COPY gameshell.sh .
 
-ENTRYPOINT ["./GameShell.sh"]
+ENTRYPOINT ["bash", "./gameshell.sh"]