git rebase master

./bin/celerity map as this touches a JS file

I do not recommend, because https://phabricator.wikimedia.org/T293139 - Phorge displays whatever it gets, especially if the video got deleted in the meantime. Same behavior for Youtube.

add little cute comment and newline, to make it clear that the comment belongs only to that line, and really nothing else lol

It works on my computer. Thaaaanks \o/

If the goal is to make it denote "inserted text", I think it should be visually different to "underline" - something more similar to the green we use for actual diff views, maybe more subtle. Will need special handling in the color-blindness themes.