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How to change the text of the button 'Add to Quotelist'?

You can use the Filter "add_to_quotelist_text". Place the following code in your theme functions.php :

add_filter('add_to_quotelist_text','dvin_qlist_text_func');

function dvin_qlist_text_func() { return "Custom Label"; }

OR

You can you POEDIT software to change the text.

May be the following link helps:

https://www.gavick.com/documentation/wordpress-themes/wp-theme-customization/how-to-translate-wordpress-theme-into-any-language