Multiple Questions

Hello,

1) You can add this button in the file basel/inc/woocommerce.php function name – basel_quick_shop_btn(). Sorry but this additional customization is out of support scope.

2) After adding product to the cart from the Quick Shop page is reloaded and it does not work with AJAX.

3) We will implement our Infinite Scroll in the next update and you will not need to use the plugin anymore. The update will be released next week.

4) What do you mean ‘change visible’? Do you want to hide it?

5) How do you want to change it also?

Regards
XTemos Studio

Hello,

1) Try to add the following code snippet to the Custom CSS area in Theme Settings

.single-product .entry-summary .out-of-stock {
    border: 2px solid #CC1414; /* If you want change border color and width */
    color: #B50808; /* If you want change text color */
    font-size: 12px; /* If you want change font size */
    padding: 5px 10px; /* If you want change messange size */
}

2) Try to add the following code snippet to the Custom CSS area in Theme Settings

.single-product-content .product-images .onsale{
   background-color: #1aada3; /* If you want change background color */
   color: #fff; /* If you want change text color */
   font-size: 13px; /* If you want change font size */
   width: 50px; /* If you want change width */
   height: 50px; /* If you want change height */	 
}

Kind Regards
XTemos Studio

Hello,

You can change this text in POT file using Loco Translate plugin. Here is a video that demonstrates how to translate strings with this plugin https://www.youtube.com/watch?v=tAFq1yTfWfU

Kind Regards
XTemos Studio