Missing du human readable locale support (french) breaks sorting

[anisse]

When using du with -h, the locale is not taken into account by du; this breaks sorting with -h which does take into account the locale.
Reproducer:

#!/bin/bash
sort --version
du --version
echo $LANG
cd $(mktemp -d sizeXXXXX)
dd if=/dev/zero bs=1k count=1300 of=big 2> /dev/null
dd if=/dev/zero bs=1k count=500 of=small 2> /dev/null
du -axh | sort -h
rm big small

With uutils:

> ./reproducer.sh
sort (uutils coreutils) 0.8.0
du (uutils coreutils) 0.8.0
fr_FR.UTF-8
1.3M	./big
1.8M	.
500K	./small
> env LANG=C ./reproducer.sh
sort (uutils coreutils) 0.8.0
du (uutils coreutils) 0.8.0
C
500K	./small
1.3M	./big
1.8M	.

With coreutils 9.1 (sorry for the old version, I don't expect a change with a more recent one):

> ./reproducer.sh 
sort (GNU coreutils) 9.1
[cut]
fr_FR.UTF-8
500K	./small
1,3M	./big
1,8M	.
> env LANG=C ./reproducer.sh
sort (GNU coreutils) 9.1
[cut]
C
500K	./small
1.3M	./big
1.8M	.

A potential workaround is to use du -h | env LANG=C sort -h ; but this gets quite annoying.