@saskatchewan I think that trimming the language in the list entries is at this point a kind of "nice to have"...

If I can express myself frankly, look at the beginning of the list entries only for "translation purposes"...
Otherwise my eyes jump directly to the language ID in squarebrackets.

Nevertheless I've some experience with regular expressions... maybe I can take a look on that trimm process I you mind.
Just let me know.

Update:
IT, PT, EO (Esperanto) and IA (Interlingua) doesn't work neither.

Kind regards

@saskatchewan
First things first: Thank you very much for taken a look on this!! I really appreciate your support and your contribution!!

Indeed it works well for the new Wikipedia designs.

Unfortunately something is now broken on the older designs, in which on a big extent were Polyglot still working thought...

As an example: I use EN, DE, ES, CA (catalan) and AST (Asturian)

With this languages configured, I can now see correctly:

• EN https://en.wikipedia.org/wiki/Opera_(web_browser)
• DE https://de.wikipedia.org/wiki/Opera_(Browser)
• AST https://ast.wikipedia.org/wiki/España

But for ES and CA it shows correctly the title, and the languages IDs (within square brackets), but no links are shown.

Here is a screenshot on how is it displayed:

Hope this feedback helps you to move forward.

J.R.!

I love this addon, I use this for several years and I can't imagine my Wikipedia experience without this great feature.

Unfortunately, now is not working anymore...

Not sure is this was caused by an update from Wikipedia site, or from Opera site...

I would really appreciate a fix for this.