how to manualy set locale (localeconf return error 10) ?

[Jabka Atu <mashrom.head@gmail.com>]

Hello..
im runnig unstable and i need to set locale  to a diffrent  setting :
change LC_CTYPE="en_US" to LC_CTYPE=he_IL.UTF-8.
i tried using localeconf but i get error 1 when i tried to install it :

[QOUTE]
Setting up localeconf (0.9.4.1) ...
dpkg: error processing localeconf (--configure):
subprocess post-installation script returned error exit status 10
Errors were encountered while processing:
localeconf
E: Sub-process /usr/bin/dpkg returned an error code (1)
[/QOUTE]

also i tried using export in console but it won't save this setting (if 
i open new console it is back to normal).