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Add new tab in Backend in System Configuration, and implement form that contains one text field under the new tab.
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Implement Observer, triggers when a product has been saved, it should concatenate the value from the text field in System Configuration to the name of the product.
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Copy the folder code and etc to your SHOP_ROOT/app.
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Clear Cache.
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Make sure that the Module Lemundo_Testaufgabe is enabled.
This sample has been tested under Magento ver. 1.9.2.1
That is it!