Revert "Merge branch 'issue_5854' into 'master'

This reverts merge request !2992

app/models/project_services/jira_service.rb

@@ -108,8 +108,7 @@ class JiraService < IssueTrackerService
       },
       entity: {
         name: noteable_name.humanize.downcase,
-        url: entity_url,
-        title: noteable.title
+        url: entity_url
       }
     }
 
@@ -197,11 +196,10 @@ class JiraService < IssueTrackerService
     user_url = data[:user][:url]
     entity_name = data[:entity][:name]
     entity_url = data[:entity][:url]
-    entity_title = data[:entity][:title]
     project_name = data[:project][:name]
 
     message = {
-      body: %Q{[#{user_name}|#{user_url}] mentioned this issue in [a #{entity_name} of #{project_name}|#{entity_url}]:\n"#{entity_title}"}
+      body: "[#{user_name}|#{user_url}] mentioned this issue in [a #{entity_name} of #{project_name}|#{entity_url}]."
     }
 
     unless existing_comment?(issue_name, message[:body])