None
None
None
replace
replace
掲載 is publication so the verb version of that is to publish or to print.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Will also help to know 掲載 as well.
このコンテンツは、過激すぎて掲載することはできません。
The contents are way too extreme to be published.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up whatever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.