clementV-3

Problem:
The client is experiencing issues where category pages are not connected with their translated equivalents, and hreflang tags are missing on paginated category pages. Additionally, the language switcher redirects to the root category page instead of the corresponding translated category page.
Solution:
We recommended inserting custom PHP code into the theme's functions.php file to address the URL issues with the language switcher on paginated category pages. Here is the code you should add:

add_filter('icl_ls_languages', 'wpml_ls_filter');
function wpml_ls_filter($languages) {
    global $sitepress;
    $url = $_SERVER['REQUEST_URI'];
    $tokens = explode('/', $url);
    $l = $tokens[sizeof($tokens)-2];
    $sl = $tokens[sizeof($tokens)-3];
    $cl = $sl.'/'.$l.'/';
    if($sl == 'page') {
        foreach($languages as $lang_code => $language) {
            $languages[$lang_code]['url'] = str_replace($languages[$lang_code]['url'], $languages[$lang_code]['url'].$cl, $languages[$lang_code]['url']);
        }
    }
    return $languages;
}

For the hreflang tags issue, it was determined by our 2nd Tier Support that this is a default behavior and indexing paginated archive pages is not recommended. If you still require hreflang tags on paginated pages, it would require custom programming, which is outside our support scope. We recommend consulting with one of our certified partners: http://wpml.org/documentation/support/wpml-contractors/

If this solution does not resolve your issue or seems irrelevant, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If needed, please open a new support ticket at WPML support forum.