Koha can handle records in Indian regional languages well. We need to install Indic Fonts packages to display Indian languages. Even though Indic Fonts available, Firefox browser does not display the record details properly. Here is the solution to fix the regional language view problem in Koha server and client computers using Ubuntu Linux.
1. Install Indic Fonts package
sudo apt-get update
sudo apt-get install fonts-indic
2. Adjust Firefox Font settings
Firefox > Edit > Preferences
Search for "Content" through search box. Select Advanced option
Select Malayalam Language and set a font.