Fix ZenTao spelling

Rename "Zentao" to "ZenTao".
Because "ZenTao" is its official English name.

Changelog: changed
EE: true

ee/app/views/projects/integrations/zentao/issues/index.html.haml

-- page_title _('ZentaoIntegration|Zentao issues')
+- page_title _('ZentaoIntegration|ZenTao issues')
 - add_page_specific_style 'page_bundles/issues_list'
 
 .js-zentao-issues-list{ data: { issues_fetch_path: project_integrations_zentao_issues_path(@project, format: :json),

ee/app/views/projects/integrations/zentao/issues/show.html.haml

-- add_to_breadcrumbs _('Zentao issues'), project_integrations_zentao_issues_path(@project)
+- add_to_breadcrumbs _('ZentaoIntegration|ZenTao issues'), project_integrations_zentao_issues_path(@project)
 - breadcrumb_title zentao_issue_breadcrumb_link(@issue_json)
 - page_title html_escape(@issue_json[:title])
 

locale/gitlab.pot

@@ -39693,9 +39693,6 @@ msgstr ""
 msgid "ZenTaoIntegration|ZenTao user"
 msgstr ""
 
-msgid "Zentao issues"
-msgstr ""
-
 msgid "ZentaoIntegration|An error occurred while requesting data from the ZenTao service."
 msgstr ""
 
@@ -39732,9 +39729,6 @@ msgstr ""
 msgid "ZentaoIntegration|ZenTao issues"
 msgstr ""
 
-msgid "ZentaoIntegration|Zentao issues"
-msgstr ""
-
 msgid "Zoom meeting added"
 msgstr ""