Merge remote-tracking branch 'upstream/develop' into emoji-selector-update

* upstream/develop: (42 commits)
  Fix formatting in oc.json
  avoid using global class
  fix logo moving bug when lightbox is open
  Reserve scrollbar gap when body scroll is locked
  setting display: initial makes trouble, instead, toggle display: none using classname
  lock body scroll
  add body-scroll-lock directive
  install body-scroll-lock
  wire up props with PostStatusModal
  rename component
  recover autofocusing behavior
  refactor MobilePostStatusModal using new PostStatusModal
  add new module and modal to post new status
  remove needless condition
  add mention button
  wire up user state with global store
  collapse fav/repeat notifications from muted users
  do not collapse thread muted posts in conversation
  detect thread-muted posts
  do not change word based muting logic
  ...

src/components/user_card/user_card.vue

@@ -139,13 +139,13 @@
             <button
               class="btn btn-default btn-block"
               :disabled="followRequestInProgress"
-              :title="followRequestSent ? $t('user_card.follow_again') : ''"
+              :title="user.requested ? $t('user_card.follow_again') : ''"
               @click="followUser"
             >
               <template v-if="followRequestInProgress">
                 {{ $t('user_card.follow_progress') }}
               </template>
-              <template v-else-if="followRequestSent">
+              <template v-else-if="user.requested">
                 {{ $t('user_card.follow_sent') }}
               </template>
               <template v-else>
@@ -192,6 +192,15 @@
             </ProgressButton>
           </div>
 
+          <div>
+            <button
+              class="btn btn-default btn-block"
+              @click="mentionUser"
+            >
+              {{ $t('user_card.mention') }}
+            </button>
+          </div>
+
           <div>
             <button
               v-if="user.muted"