`TNode.insertBeforeIndex` is only populated when i18n is present. This change puts all code which reads `insertBeforeIndex` behind a dynamically loaded functions which are set only when i18n code executes. PR Close #39301
`TNode.insertBeforeIndex` is only populated when i18n is present. This change puts all code which reads `insertBeforeIndex` behind a dynamically loaded functions which are set only when i18n code executes. PR Close #39301