Improve message of multiple instances without oplog

packages/rocketchat-i18n/i18n/en.i18n.json

@@ -291,6 +291,7 @@
   "clear_cache_now": "Clear cache now",
   "Clear_all_unreads_question": "Clear all unreads?",
   "Click_here": "Click here",
+  "Click_here_for_more_info": "Click here for more info",
   "Client_ID": "Client ID",
   "Client_Secret": "Client Secret",
   "Clients_will_refresh_in_a_few_seconds": "Clients will refresh in a few seconds",
@@ -420,7 +421,8 @@
   "Enter_name_here": "Enter name here",
   "Enter_to": "Enter to",
   "Error": "Error",
-  "Error_OpLog_ReplicaSet_should_be_enabled_when_running_multiple_instances": "Error: OpLog (ReplicaSet) should be enabled when running multiple instances",
+  "Error_RocketChat_requires_oplog_tailing_when_running_in_multiple_instances": "Error: Rocket.Chat requires oplog tailing when running in multiple instances",
+  "Error_RocketChat_requires_oplog_tailing_when_running_in_multiple_instances_details": "Please make sure your MongoDB is on ReplicaSet mode and MONGO_OPLOG_URL environment variable is defined correctly on the application server",
   "error-action-not-allowed": "__action__ is not allowed",
   "error-application-not-found": "Application not found",
   "error-archived-duplicate-name": "There's an archived channel with name '__room_name__'",

packages/rocketchat-ui-admin/admin/adminInfo.html

@@ -9,10 +9,11 @@
 		<div class="content">
 			{{#if $gt statistics.instanceCount 1}}
 				{{#unless statistics.oplogEnabled}}
-					<h1 class="alert error-color error-border error-background">
-						{{_ "Error_OpLog_ReplicaSet_should_be_enabled_when_running_multiple_instances"}}<br/>
-						<a href="https://docs.mongodb.com/manual/tutorial/deploy-replica-set/">https://docs.mongodb.com/manual/tutorial/deploy-replica-set/</a>
-					</h1>
+					<div class="alert error-color error-border error-background">
+						<b>{{_ "Error_RocketChat_requires_oplog_tailing_when_running_in_multiple_instances"}}</b><br/><br/>
+						{{_ "Error_RocketChat_requires_oplog_tailing_when_running_in_multiple_instances_details"}}<br/><br/>
+						<a target="_blank" href="https://rocket.chat/docs/installation/manual-installation/multiple-instances-to-improve-performance/#running-multiple-instances-per-host-to-improve-performance">{{_ "Click_here_for_more_info"}}</a>
+					</div>
 				{{/unless}}
 			{{/if}}