Update zh_CN translations: Menu contexts, About Panel (#2982)

* Add Chinese Simplified Translator

* zh_CN translation: About panel

* zh_CN translation: Menu context

Author: RipplePiam

src/robotide/localization/TRANSLATORS.adoc

@@ -5,4 +5,5 @@ ifdef::env-github[:outfilesuffix: .adoc]
 - Minerva Järvensivu: Finnish
 - https://github.com/HelioGuilherme66[Hélio Guilherme]: Portuguese, Brazilian Portuguese
 - Hyeonho Kang: Korean
+- https://github.com/ripplepiam[Bo Pan]: Chinese Simplified
 - Unknown: Pirates