[arch-general] cannot set locale (systemd)

[Thanos Zygouris]

After upgrading systemd (189-3) and filesystem (2012.8-1) my locale 
isn't en_US.UTF-8 anymore. Instead, it defaults to C.

# cat /etc/locale.conf:
LOCALE=en_US.UTF-8
LC_COLLATE=C

# locale
LANG=C
LC_CTYPE="C"
LC_NUMERIC="C"
LC_TIME="C"
LC_COLLATE=C
LC_MONETARY="C"
LC_MESSAGES="C"
LC_PAPER="C"
LC_NAME="C"
LC_ADDRESS="C"
LC_TELEPHONE="C"
LC_MEASUREMENT="C"
LC_IDENTIFICATION="C"
LC_ALL=

I tried to run /etc/profile.d/locale.sh manually, but nothing changed.
If i manually export LANG="en_US.UTF-8", it works, but i suspect it's
not the "correct" way.

So, is there a bug, or i am just missing something?