[Listify][facetWP] Changing the Search button value

Im using Listify and FacetWP plugin and I’d like to change the value of the homepage search button to put there call to action instead. But I can’t locate the code to make this change. I was able to change the placeholder, but can’t do that for Search button. I looked for similar topics and couldn’t really find anything except editing searchform.php file which didn’t make any changes to me. Thanks for any help.
Link to my site: calsolarcontractors.com