Fix follow-up ZenTao string issue

Add namespace for ZenTao user to prevent potential error

ee/app/assets/javascripts/integrations/zentao/issues_show/components/sidebar/zentao_issues_sidebar_root.vue

@@ -2,7 +2,7 @@
 import Assignee from 'ee/external_issues_show/components/sidebar/assignee.vue';
 import IssueDueDate from 'ee/external_issues_show/components/sidebar/issue_due_date.vue';
 import IssueField from 'ee/external_issues_show/components/sidebar/issue_field.vue';
-import { __ } from '~/locale';
+import { s__, __ } from '~/locale';
 import LabelsSelect from '~/vue_shared/components/sidebar/labels_select_vue/labels_select_root.vue';
 
 export default {
@@ -31,7 +31,7 @@ export default {
   i18n: {
     statusTitle: __('Status'),
     referenceName: __('Reference'),
-    avatarSubLabel: __('Zentao user'),
+    avatarSubLabel: s__('ZenTaoIntegration|ZenTao user'),
   },
 };
 </script>

ee/spec/frontend/integrations/zentao/issues_show/components/sidebar/zentao_issues_sidebar_root_spec.js

@@ -44,7 +44,7 @@ describe('ZentaoIssuesSidebar', () => {
     const assignee = findAssignee();
 
     expect(assignee.props('assignee')).toBe(mockZentaoIssue.assignees[0]);
-    expect(assignee.props('avatarSubLabel')).toBe('Zentao user');
+    expect(assignee.props('avatarSubLabel')).toBe('ZenTao user');
   });
 
   it('renders IssueDueDate', () => {

locale/gitlab.pot

@@ -39678,9 +39678,6 @@ msgstr ""
 msgid "Zentao issues"
 msgstr ""
 
-msgid "Zentao user"
-msgstr ""
-
 msgid "ZentaoIntegration|An error occurred while requesting data from the ZenTao service."
 msgstr ""