Merge branch 'release-20.0.0' into develop
Use an extra span so that we can modify what used to be called `<rb>`.
Get rid of the box classes. Users should do that via plain CSS.
HowJSay. Pretty simple when you know the url.
Drop normalization of downloaded file names. Check file names as NFC, not NFD.
Bump version.
Bump version.
Dropping the box classes makes this not backward compatible, so bump major.
Merge branch 'release-21.0.0'