Dockerfile: add boost locale

Dockerfile

@@ -29,7 +29,7 @@ RUN curl -s -L -o  boost_${BOOST_VERSION}.tar.bz2 https://dl.bintray.com/boostor
     && tar -xvf boost_${BOOST_VERSION}.tar.bz2 \
     && cd boost_${BOOST_VERSION} \
     && ./bootstrap.sh \
-    && ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread threading=multi threadapi=pthread cflags="-fPIC" cxxflags="-fPIC" stage
+    && ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --with-locale threading=multi threadapi=pthread cflags="-fPIC" cxxflags="-fPIC" stage
 ENV BOOST_ROOT /usr/local/boost_${BOOST_VERSION}
 
 # OpenSSL