- After installation goto https://drupal.org/node/275705
- Install Internationalization and Variable module
- Enable Locale, Contact and Content translation in Core
- Enable Variable, Variable realm and Variable store in Variable
i18n
- Locate the translation file: Go to https://localize.drupal.org/, click on the required language name, you will be redirected to the selected language's translation page.
- Download the file that is relevant to your version (I downloaded the file next to 7.22, on the Drupal core project). It should have .po extension.
- Go to the file system: Go directly to your file system on your localhost, use an ftp client or the control panel for your hosting server file system.