Magento Currency Symbole Position and Pattern Issue

I was building my fashion store using using a purchased magento theme. After I finish everything, I noticed that the currency symbole position and pattern is wrong. These are what I have done before,

1.) Disabled all store views except Germany. 2.) Renamed "Madison Island" Store name to "Style Hive", 3.) Renamed store view "Germany" to "Sri Lanka".

----------My current Currency Setup--------------

Base Currency : Sri Lankan Rupee Default Display Currency : Sri Lankan Rupee

My website is : www.stylehive.lk

As an example the store shows a price of product as "5.568,00 Rs" But it should be "Rs 5,568.00"

Here is a example image.

Another example, Price shows as "520,00 Rs", but it should be "Rs 520.00"

I tried to change xml files in lib/zend/locale/data ....But it didn't worked. I changed the "de.xml" file. May be I have changed the wrong file. I am not sure.

Please help me to fix this issue.