add title and alt for avatars, fix console errors in avatarlist

src/components/basic_user_card/basic_user_card.vue

@@ -1,7 +1,11 @@
 <template>
   <div class="basic-user-card">
     <router-link :to="userProfileLink(user)">
-      <UserAvatar class="avatar" @click.prevent.native="toggleUserExpanded" :src="user.profile_image_url"/>
+      <UserAvatar
+        class="avatar"
+        :user="user"
+        @click.prevent.native="toggleUserExpanded"
+      />
     </router-link>
     <div class="basic-user-card-expanded-content" v-if="userExpanded">
       <UserCard :user="user" :rounded="true" :bordered="true"/>