Hi Michael
> I suspect that Google may have set a cookie or something. Normally google.fr takes you to the French version of google.com.
I have many browsers in my laptop, but every browser has seen something Google, unfortunately. Just now I installed Microsoft Edge weekly (microsoft-edge-beta) afresh, and this is what I get:

Looks like Google detects many things.
> I get a lot of other span tags, mostly specifying the font size for no
reason.
Me too. Time for another rant somewhere. Will check in another forum.
> But I have yet to see Moodle generate so many language tags. Are
you doing this in 4.0 by chance?
No I am on Moodle 3.9.
> Try to make sure that your Moodle language UI is the same as the content you are typing, and also the language of your keyboard.
True, I sometimes copy between two browser windows displaying Moodle, the selected languages being different. Will keep an eye.
> you are copying content from a Word (or something similar) document
Definitely not MS Word, my desktop is Debian GNU/Linux, also not LibreOffice or any other
WYSIWYG program, since I don't use them. On rare occasions I get text copied from PDFs though. I get much more si-LK attributes for that. Will keep my eyes open.