xfterm4, debian testing, xfce 4.0.6

[Rakotomandimby (R12y) Mihamina]

Hello,
I noticed a problem recently with xfterm4: It does not launch the
terminal.
It happended after an 'apt-get upgrade', and i did not changes my
locales:

If i run xfterm4 in a terminal, I get :

$ xfterm4 
uxterm tried to use locale en_US.UTF-8
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or
directory
locale: Cannot set LC_ALL to default locale: No such file or directory

$ locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or
directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en_GB
LC_CTYPE=en_US
LC_NUMERIC="en_GB"
LC_TIME="en_GB"
LC_COLLATE="en_GB"
LC_MONETARY="en_GB"
LC_MESSAGES="en_GB"
LC_PAPER="en_GB"
LC_NAME="en_GB"
LC_ADDRESS="en_GB"
LC_TELEPHONE="en_GB"
LC_MEASUREMENT="en_GB"
LC_IDENTIFICATION="en_GB"
LC_ALL=

What should I change or set?

Note: If i just run 'xterm', it launches.
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