Magento - Translation Setup

You can translate the default Magento interface via CSV file as given below −
Look in your (root)/app/locale/en_US folder. There you have the .csv that do the translation. Mage_Catalog.csv contains translations for all files that use the /app/code/core/Mage/Catalogue/ and /app/design/frontend/default/default/locale/en_US/translate.csv template files . You'll also find Mage_Adminhtml.csv here , which handles most admin translations.
If Magento translation fails, you should check your store settings in the admin panel to make sure there is something wrong with your locale.
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In the Magento admin panel, go to the System menu and click Configuration .
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Select the Store View Configuration Area in the upper left corner.
In the Magento admin panel, go to the System menu and click Configuration .
Select the Store View Configuration Area in the upper left corner.
On the General Configuration page, expand the Locale Settings section .
Under Language Options, set Language to the new language for the store view and click the Save Configuration button.