add mention button

src/components/user_card/user_card.js

@@ -168,6 +168,9 @@ export default {
       }
       this.$store.dispatch('setMedia', [attachment])
       this.$store.dispatch('setCurrent', attachment)
+    },
+    mentionUser () {
+
     }
   }
 }

src/components/user_card/user_card.vue

@@ -188,6 +188,15 @@
             </ProgressButton>
           </div>
 
+          <div>
+            <button
+              class="btn btn-default btn-block"
+              @click="mentionUser"
+            >
+              {{ $t('user_card.mention') }}
+            </button>
+          </div>
+
           <div>
             <button
               v-if="user.muted"