yes maybe its a way to solve the issue , but , with this library just sometimes this happens , if you see the the header title the letter "ñ" its rendered ok.
if you see the code in the images the lib ABmaterial render de html page with this "�" the code generated is "<label id="inpdescamplabel" for="inpdescamp" class="">Descripci�n Campa�a</label>"
But not always "<a id="pagenavbar" class="brand-logo white-text" style="width: 1001px;">Campañas</a>" the Ñ letter appears in the same web page.
may be your suggestion it's a safe workaround.
But i think that Abmaterial has some type of properties that handle this
Regards.