This extension disable Add to cart button on all product locations if the product is Out of Stock, and also replace the Add to Cart button name with product Stock Status (Pre-Order, 2-3 Days, etc).

Replace the button on the following pages/modules:

- product page
- category page
- latest module
- special module
- bestseller module
- featured module

Demo:
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Installation
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Just upload the .xml file to your vqmod/xml folder.

I offer free adaptation for any custom theme.