Open PHPMyadmin in Web browser
http://127.0.0.1/phpmyadmin/
select your database
select systempreferences table
Click on Insert
Type following in value column
variable varchar(50) GoogleIndicTransliteration
value text 1
explanation text Google Indic Transliteration
type varchar(20) YesNo
Save the value and quit from PHPMyAdmin
Open Your OPAC page in web browser (Internet connectivity is necessary for working Google Indic Transliteration
How to Add or Remove language in OPAC search
Edit your goolge indic js file:
sudo gedit /usr/share/koha/opac/htdocs/opac-tmpl/prog/en/js/googleindictransliteration.js
LanguageCode maps name constants to language codes that you can use to specify the source and destination languages in the transliteration methods.
ENGLISH: 'en',
AMHARIC: 'am',
ARABIC: 'ar',
BENGALI: 'bn',
CHINESE: 'zh',
GREEK: 'el',
GUJARATI: 'gu',
HINDI: 'hi',
KANNADA: 'kn',
MALAYALAM: 'ml',
MARATHI: 'mr',
NEPALI: 'ne',
ORIYA: 'or',
PERSIAN: 'fa',
PUNJABI: 'pa',
RUSSIAN: 'ru',
SANSKRIT: 'sa',
SINHALESE: 'si',
SERBIAN: 'sr',
TAMIL: 'ta',
TELUGU: 'te',
TIGRINYA: 'ti',
URDU: 'ur'
http://code.google.com/apis/language/transliterate/v1/reference.html