Add "export LC_ALL=C" to all shell scripts

contrib/qos/tc.sh

@@ -2,6 +2,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 #network interface on which to limit traffic
 IF="eth0"
 #limit of the network interface in question