How To Set Default Language and Currency in Magento
In your Magento admin go to System > Manage Stores
Click on Main Website Store under the Store Name (if there are several ones, click any of them)
Now every time you are opening the your site, it’s going to be in the language you selected.
You can change the default language for the backend by going to System -> Configuration -> General -> Locale options.
To change the default ($) currency on the your Magento site
In admin panel, go to Admin > System > Configuration > Currency Set up.
Select currency that you want to be default from your base currency drop down.
Select the same currency in the Default Display Currency drop down and from the Allowed Currencies list
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Download This Magento Currency Switcher Extension for your online store to enhance the performance of your webstore.