"languages" tag

OK, this appears to be a caching issue in action. I've cleared the cache, and I got localised names in Dutch. After that, adding "uselang=en" again gave me language names in Dutch. This behaviour has not happened until recently, so we'll look into it.

Likely the same issue we had with the table of contents.

Niklas made an update for translatable pages to avoid this (mwr:71165).

Where can I localize the names of languages?

In CLDR.