The source does not change the family only the width on the front and does not show any error in the console!
@import url("https://fonts.googleapis.com/css?family=Ubuntu");
.menu-vin li a{
display:block;
text-decoration: none;
font-family: 'Ubuntu', sans-serif;
}<ul class="list-inline menu-vin">
<li class="list-inline-item"><a href="/">INICIO</a></li>
<li class="list-inline-item"><a href="/quemsomos">QUEM SOMOS?</a></li>
<li class="list-inline-item"><a href="/celulas">CÉLULAS</a></li>
<li class="list-inline-item"><a href="/contato">CONTATO</a></li>
</ul>
@import url("https://fonts.googleapis.com/css?family=Ubuntu");
.menu-vin li a{
display:block;
text-decoration: none;
font-family: 'Ubuntu', sans-serif;
}