Special characters issues

Hi,

first of all, I’m very happy with your plugin, and I will only inform you that it has some small issues with special (non-English) characters. For example:

1- When using a keyword that has special characters like ö or ü or á or ç or ñ (Used in the German and Spanish language). Example: for the keyword “colección glööcker”, a slug “coleccion-gloocker” is generated (special characters are not allowed in the slug (and that is fine).

But RankMath does not detect that the keyword is used in the slug, but without special characters, and the message “Focus Keyword not found in the url” is shown.

2.- Stop words: I configured Spanish stopwords in the section “Seo Settings->Links->Remove Stop Words from permalinks”. And the stop words are removed from the permalinks. For example, if my focus keyword and the title is “pantalones de montar” and “de” is configured as a stopword, then the slug “pantalones-montar” is generated, and that is correct. But again the message “Focus keyword not found in the url” is shown. I suppose it is looking for the complete focus keyword with stopword included.

Thank you for your great plugin.