[ArticleFeedbackv5] Complete overhaul of the optional and ignore message

Shirayuki pointed out some inconsistencies
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Articlefeedbackv5-noteflyover-unfeature-description/en

Change-Id: I2e95517e7ac1ae8fc34021d899440df832c96f2e