chore: Translate transifex_input.json in zh_CN

98% 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-learning/src/i18n/messages/zh_CN.json

@@ -26,6 +26,7 @@
   "learn.coursewareSerch.closeAction": "Close the search form",
   "learn.coursewareSerch.searchModuleTitle": "Search this course",
   "learn.coursewareSerch.searchBarPlaceholderText": "Search",
+  "learn.coursewareSerch.searchResultsNone": "No results found.",
   "learning.dates.badge.completed": "已完成",
   "learning.dates.badge.dueNext": "下一个到期",
   "learning.dates.badge.pastDue": "逾期",