Fixes the three `FullEditor.spec.js` slash-menu failures that appeared after #15291 and #15296 crossed on develop: #15296 added slash-menu specs that assert real translated labels ("Divider", "Heading 1"), while #15291 emptied the global i18n catalogue in the vitest setup, so `t()` started returning raw keys like `SLASH_COMMANDS.DIVIDER`. The spec now calls `withFullI18n()` from the `test-i18n` helper introduced in #15291, opting into the full message catalogue the same way `MacroProperties.spec.js` does. Test-only change, no production code touched. Related: https://github.com/chatwoot/chatwoot/pull/15291