DM and Modal changes (#2927)

* DM and Modal changes

* Fixing image previews

webapp/i18n/en.json

@@ -1129,6 +1129,7 @@
   "sidebar.createGroup": "Create new group",
   "sidebar.direct": "Direct Messages",
   "sidebar.more": "More",
+  "sidebar.otherMembers": "Other teams",
   "sidebar.moreElips": "More...",
   "sidebar.pg": "Private Groups",
   "sidebar.removeList": "Remove from list",