Merge branch 'fix/hide-read-button' into 'develop'

Don't show "read" button if there are no new notifications.

See merge request !184

src/components/notifications/notifications.vue

@@ -4,7 +4,7 @@
       <div class="panel-heading base02-background base04">
         <span class="unseen-count" v-if="unseenCount">{{unseenCount}}</span>
         {{$t('notifications.notifications')}}
-        <button @click.prevent="markAsSeen" class="base04 base02-background read-button">{{$t('notifications.read')}}</button>
+        <button v-if="unseenCount" @click.prevent="markAsSeen" class="base04 base02-background read-button">{{$t('notifications.read')}}</button>
       </div>
       <div class="panel-body base03-border">
         <div v-for="notification in visibleNotifications" :key="notification" class="notification" :class='{"unseen": !notification.seen}'>