The first step to translating your store is to select the additional languages you want your store to be displayed in. Once you select additional languages, a new drop-down list appears at the top of the administration interface. When you are ready to translate components of your catalog and store into a new language, select that language from the list before you start translation tasks.
To select additional languages your store supports:
On the Settings tab, click Site Settings.
On the Location tab, click the Additional Store Languages field and select a language.
Repeat this step for each new language your store will support.
When you remove any of the additional languages, shoppers can no longer select them from the Language list on your store.
To remove a supported language from your store:
On the Settings tab, click Site Settings.
On the Location tab, in the Additional Store Languages field, click the X icon in the corner of the language you want to remove.