Hello Hari,
thanks for your interest in Sahana translation.
Malayalam has been added to the languages list at our PootleServer at
http://translate.sahana.lk.
Please download all the sahana-*.po files from
http://translate.sahana.lk/ml/sahana062
(you won't need to be registered at the site to do this), translate
them with your favorite PO editing tool (you may even translate
online, if you want), and then send in the translated PO files to this
mailing list here.
Please see also instructions at
http://wiki.sahana.lk/doku.php?id=translate:home
Malayalam is one of the Indian languages, so it is Ajay Kumar who
maintains this translation. Please contact him via this GoogleGroup
(if he does not automatically contact you) for further instruction and
support.
Kind regards,
Dominic