chore: Translate transifex_input.json in zh_CN

51% of minimum 50% translated source file: 'transifex_input.json'
on 'zh_CN'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

translations/frontend-app-course-authoring/src/i18n/messages/zh_CN.json

@@ -81,6 +81,7 @@
   "course-authoring.export.title-under-button": "Export my course content",
   "course-authoring.export.button.title": "Export course content",
   "authoring.loading": "载入中...",
+  "authoring.alert.error.notfound": "Not found.",
   "authoring.alert.error.permission": "您无权查看此页面。如果您觉得自己应该有访问权限，请联系您的课程团队管理员以获得访问权限。",
   "authoring.alert.save.error.connection": "我们在应用更改时遇到技术错误。这可能是暂时性问题，因此请过几分钟再试。如果问题仍然存在，请前往 {supportLink} 寻求帮助。",
   "course-authoring.grading-settings.heading.title": "评分",
@@ -192,6 +193,8 @@
   "course-authoring.taxonomy-list.butotn.download-template.hint": "Download example taxonomy",
   "course-authoring.taxonomy-list.button.import.label": "导入",
   "course-authoring.taxonomy-list.select.org.default": "All taxonomies",
+  "course-authoring.taxonomy-list.select.org.all": "All",
+  "course-authoring.taxonomy-list.select.org.unassigned": "Unassigned",
   "course-authoring.taxonomy-list.spinner.loading": "正在加载",
   "course-authoring.taxonomy-list.toast.delete": "\"{name}\" deleted",
   "course-authoring.advanced-settings.modal.error.description": "There was {errorCounter} while trying to save the course settings in the database. Please check the following validation feedbacks and reflect them in your course settings:",