You can do it via CSS. Change the tile # to the tile you are targeting.
.tile-title::after {
visibility: visible;
position: absolute;
text-align: center;
left: inherit;
right: 0;
bottom: 0;
white-space: pre-wrap;
}
#tile-2 .tile-title { visibility : hidden !important;}
#tile-2 .tile-title:after { content: 'PUT NEW NAME HERE' !important; }
Read the full post by @markus for more details
You can also do this via smartly.