'You can now translate' message
I've reported this twice to Duolingo, but the problem is still not fixed. As I complete lessons in the Italian section, the message which appears at the end of the lesson contains a lesser, not a greater, percentage. For example, yesterday the message advised 'You can now translate 73.3% of all Italian text. Want to try?' Today, after I completed two additional lessons, the percentage went down to 73.1%. This must be happening to everyone who completes lessons in the Italian section, no?
I think you're onto something. Some of the lessons I completed earlier are now showing up as needing strengthening, but I don't think I've 'forgotten' words in those lessons and Duolingo has somehow figured that out! I suspect that Duolingo has made changes to those lessons, and uses an algorithm which automatically adjusts for the fact that I haven't done the new sentences in those lessons, when then decreases the percentage of text Duolingo alleges I can translate.