Add extra copy for empty state

app/views/jira_connect/subscriptions/index.html.haml

@@ -50,6 +50,7 @@
     - else
       %h4.empty-subscriptions
         No linked namespaces
+      %p= s_('Integrations|Namespaces are your GitLab groups and subgroups that will be linked to this Jira instance.')
 
   %p.browser-limitations-notice
     %strong Browser limitations:

locale/gitlab.pot

@@ -15129,6 +15129,9 @@ msgstr ""
 msgid "Integrations|Issues created in Jira are shown here once you have created the issues in project setup in Jira."
 msgstr ""
 
+msgid "Integrations|Namespaces are your GitLab groups and subgroups that will be linked to this Jira instance."
+msgstr ""
+
 msgid "Integrations|Projects using custom settings will not be affected."
 msgstr ""