Add confirmation for muting

src/components/user_card/user_card.vue

@@ -314,6 +314,24 @@
         :handle-links="true"
       />
     </div>
+    <confirm-modal
+      :showing="showingConfirmMute"
+      :title="$t('user_card.mute_confirm_title')"
+      :confirm-text="$t('user_card.mute_confirm_accept_button')"
+      :cancel-text="$t('user_card.mute_confirm_cancel_button')"
+      @accepted="doMuteUser"
+      @cancelled="hideConfirmMute"
+    >
+      <i18n
+        path="user_card.mute_confirm"
+        tag="span"
+      >
+        <span
+          place="user"
+          v-text="user.screen_name_ui"
+        />
+      </i18n>
+    </confirm-modal>
   </div>
 </template>