build.sh: use LANG=C

build.sh

@@ -57,6 +57,7 @@ PATCH_DIR="site/patches"
 OUTPUT_DIR="${MY_DIR}/output"
 BUILD_INFO_FILENAME="build-info.txt"
 VERSIONS_INFO_DIR="versions"
+LANG=C
 
 pushd $MY_DIR > /dev/null
 [ "_$BUILD_TS" == "_" ] && export BUILD_TS=$(date +"%Y-%m-%d %H:%M:%S")