JS --> JavaScript

https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Globalcssjs-desc/en

Change-Id: I79ed944b9227773a0b7ba2d8db2a5643fc420286
Improve 'globalcssjs-desc' message

https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Globalcssjs-desc/en_%282%29

Change-Id: I0d5e60fbeb5c8fa4ed2616de7e07cd5d2784addc
Merge "JS --> JavaScript"
Merge "Improve 'globalcssjs-desc' message"