url_title and apostrophe

URL Helper ain't an expert on foreign characters, but convert_accented_characters() are.
url_title(convert_accented_characters('L'apostrophe'));

https://www.codeigniter.com/user_guide/h...characters

Can't seem to find it, so you need to add it in your application/config/foreign_chars.php
'/L\'/' => 'L-',