[tldoc] TL translation strings updated

[Karl Berry]

On another front, for those of you who translate the runtime strings for
TeX Live, there have been a bunch of changes, hopefully making better
translations possible as a result.

If you don't know/remember what this is all about, but might be
interested :), see our terse description at
https://tug.org/texlive/doc.html#install-tl-xlate ... --thanks, karl.