[SM-I18N] Complete Khmer translation for quirrelmail

[Khoem S. <kho...@kh...>]

Dear Fredrik,

After we have talked vi email about Khmer translation for squirrel now my team 
finished translating all for squirrel.
Please find the attachment for the completed Khmer translations for squirrel 
mail.

Could you please help to commit this translation for Khmer?

I would be great if I have svn  access right for maintaining the translation 
in the future.
The code for Khmer  is km_KH.

Thank in advance for your help.

Best Regards,
Khoem Sokhem