use dir="auto" to have better RTL support for messages

related: #182

app/partials/desktop/message.html

@@ -65,7 +65,7 @@
 
         </div>
 
-        <div class="im_message_text" ng-if="::historyMessage.message.length || false" ng-bind-html="::historyMessage.richMessage"></div>
+        <div class="im_message_text" ng-if="::historyMessage.message.length || false" ng-bind-html="::historyMessage.richMessage" dir="auto"></div>
         <div class="im_message_external_embed_wrap" ng-if="::historyMessage.richUrlEmbed || false" my-external-embed="historyMessage.richUrlEmbed"></div>
       </div>
 

app/partials/mobile/message.html

@@ -55,7 +55,7 @@
 
         </div>
 
-        <div class="im_message_text" ng-if="::historyMessage.message.length || false" ng-bind-html="::historyMessage.richMessage"></div>
+        <div class="im_message_text" ng-if="::historyMessage.message.length || false" ng-bind-html="::historyMessage.richMessage" dir="auto"></div>
       </div>
 
     </div>