Use en_US.UTF-8 (not C.UTF-8)

Author: nigredo-tori

Dockerfile

@@ -27,8 +27,8 @@ COPY --from=add-apt-repositories /etc/apt/sources.list /etc/apt/sources.list
 RUN apt-get update \
  && DEBIAN_FRONTEND=noninteractive apt-get install -y acl sudo locales \
       postgresql-${PG_VERSION} postgresql-client-${PG_VERSION} postgresql-contrib-${PG_VERSION} \
- && update-locale LANG=C.UTF-8 LC_MESSAGES=POSIX \
  && locale-gen en_US.UTF-8 \
+ && update-locale LANG=en_US.UTF-8 LC_MESSAGES=POSIX \
  && DEBIAN_FRONTEND=noninteractive dpkg-reconfigure locales \
  && ln -sf ${PG_DATADIR}/postgresql.conf /etc/postgresql/${PG_VERSION}/main/postgresql.conf \
  && ln -sf ${PG_DATADIR}/pg_hba.conf /etc/postgresql/${PG_VERSION}/main/pg_hba.conf \