Add lang hyphen, if not exists for HTML tags

Arch Linux Firefox doesn't set lang="ja" as Japanese

Autor
Pacharapol Withayasakpunt (Pol)
Instalaciones diarias
0
Instalaciones totales
1
Calificaciones
0 0 0
Versión
0.1.4
Creado
18/4/2022
Actualizado
3/5/2022
Licencia
MIT
Funciona en
Todos los sitios

Firefox on Arch Linux doesn't detect lang attribute without hyphens

This bug should probably eventually be fixed, but I made this for the time being.