ejabberd-contrib/mod_pottymouth/conf/mod_pottymouth.yml

modules:
    mod_pottymouth:
        blacklists:
            default: /home/vagrant/blacklist_en.txt
            en: /home/vagrant/blacklist_en.txt
        charmaps:
            default: /home/vagrant/charmap_en.txt
            en: /home/vagrant/charmap_en.txt