Jarek Glowacki

Yep, in my case "Translation wasn't saved" meant "Session expired".

Nothing further to add.

Just got this same error recently.

As suggested above, it turns out my session had expired.

Keeping my article-editing window open, I span up a separate tab, logged into Zendesk anew, returned to my article tab and was able to save without the error this time.

Would be nice if the error could mention expired session, or offer a re-log popover without leaving the page.

But at least the current cryptic error is easily googleable. :)