src/app/component/word/like/word-like.component.html
<img
alt="a white, filled heart"
src="/assets/image/heart-filled.svg"
title="unlike this word"
[class.show]="isLiked"
(click)="likeWord($event, word)"/>
<img alt="a white, outlined heart"
src="/assets/image/heart.svg"
[class.show]="!isLiked"
title="like this word"
(click)="likeWord($event, word)"/>