Fix the output of the XML sitemap so they show the correct localised URLs. This is an add-on for when you change the URLs using other techniques, see README.

seo-sitemap-with-wpml-content-url-fix.php

<?php

// supports Yoast SEO and Yoast SEO Premium
add_filter('wpseo_sitemap_entry', 'wpseo_sitemap_entry', 10, 3);
// Supports SEO by Rank Math
add_filter('rank_math/sitemap/entry', 'wpseo_sitemap_entry', 10, 3);

function wpseo_sitemap_entry ( $url, $type, $object ) {
	
	global $sitepress;
	$current_language = $sitepress->get_current_language();
		
	if ($type == 'term') {

		$data = null;
		$search = array('element_id' => $object->term_id, 'element_type' => $object->taxonomy );
		$language = apply_filters('wpml_element_language_details', $data, $search);

		if ($language && is_object($language) && isset($language->language_code)) {
			$sitepress->switch_lang($language->language_code);
			$url['loc'] = get_term_link($object, $object->taxonomy);
		}
		$sitepress->switch_lang($current_language);
	}
	else if ($type != 'user') { // post, page, cpts
		
		$data = null;
		$search = array('element_id' => $object->ID, 'element_type' => $type );
		$language = apply_filters('wpml_element_language_details', $data, $search);

		if ($language && is_object($language) && isset($language->language_code)) {
			$sitepress->switch_lang($language->language_code);
			$url['loc'] = get_permalink($object->ID);
		}
		$sitepress->switch_lang($current_language);
	}

	return $url;
}

xxDocumentation.md

Fix the output of the XML sitemap so they show the correct localised URLs. This is an add-on for when you change the URLs using other techniques.

With WPML you can localize the slug of your CPT single, but not your CPT archive, if you give it a different content. You can fix the translations with https://gist.github.com/rmpel/d9989da79956fb0eafe81e49331b84b6 .

With WPML you can localize the "page for posts", but this will not localize the post-URL-base. You can fix this with https://gist.github.com/rmpel/5672b2b943a4a015fe1777c0a31fac59 .