From the google play store you can install the malayalam handwriting tool easily. If you are not sure about google play store, check the following image. You can find how to open and use google play store.
Once you rooted the mobile follow these simple steps 1- Download and install ES File Explorer to mobile from Android Market. 2- Open ES File Explorer. 3- Allow the Super User permission.
4- Under the settings menu check ‘Root Explorer’ and ‘Mount File System’. 5-Change the Home directory to “/” 6- Download DroidSansFallback.zip to the pc. 7-Extract and copy the file ( DroidSansFallback.ttf ) to sd card 8-using ES file explorer Copy the DroidSansFallback.ttf and paste it in /System/Fonts folder 9-Which will ask to replace the existing file,replace it( Its advised to back up the copy of the same). 10-Now take browser or Facebook app and enjoy reading in your mother tongue. Rendered Malayalam font in Facebook App You can see that the rendering is not perfect, but still we can read it. Something is better than nothing right. Thank for the original writer.