How I fixed Wordpress category page title: Category <span>...</span>

One one of my Wordpress sites, the title of category pages was literally

Category <span>My category</span>

Searching through the theme source code didn’t yield a solution quickly, so I added this custom JS using a plugin:

jQuery(document).ready(function( $ ){
    if(jQuery("h1.page-title").text().includes("Category: <span>")) {
        var input = jQuery("h1.page-title").text();
        var output = /<span>(.*)<\/span>/g.exec(input)[1];
        jQuery("h1.page-title").text(output);
    }
});

This will just replace the title by the content of the span tag. You might need to adjust the CSS classes for your theme.