Fix to work with current (2021) website

[JohnVeness]

Hello. Many thanks for this app. I humbly submit some changes to make it work with the current version of the website.

It seems that Duolingo obfuscated the class names so the old code no longer worked. I have tried to change to other unique IDs, although I couldn't find an alternative to "_3alTu" for when finding the correctly-matched word pairs, which looks messy.

In general, my changes are rather hacky, and I'm sure cleaner solutions could be found. For example

• I increased the window width so that a login button would appear (with a narrow width it was hidden within a menu)
• I found that logging in sometimes didn't work, I think because the process was interrupted by loading the story 0.5 seconds after clicking submit, so I increased the timeout for that. It would be nice instead to properly check if login succeeded
• I changed button_group_answer to look for @data-test='stories-token' in order to fix finding the word pairs, but that didn't work for the entities used when calling button_group_answer('hält sie an') in de_verkehrskontrolle-teil-1.py, so I changed it to (@data-test='stories-token' or @data-test='stories-choice') instead. This feels messy, and probably there should be a separate function for looking for multichoice questions
• I couldn't work out how to read the XP, so I've just faked it for now!
• Finding the correct buttons to click and the end of a story don't always work, e.g. in stories that have a "part 1" and a "part 2", at the end of "part 1" for the first time only, it will say continued in part 2, but that means the continue button doesn't work and the program hangs. To be honest, you could probably just stop as soon as the XP is shown to the user, without needing to click on Continue buttons after that

I would be very happy for you to incorporate these fixes, or improve them in any way!

[renzhengyu]

Thanks for keeping the bot up-to-date.

[JohnVeness]

With the narrower window, I was able to run 8 windows at the same time and see their progress. I also found the windows have to be visible for the code to work. A better fix than simply widening the window is to interpret the new drop-down menu but this is a good quick fix.

Alternatively, what about visiting https://www.duolingo.com/?isLoggingIn=true rather than trying to find and click a login button or menu option?

Or maybe even visiting the full story URL with ?isLoggingIn=true after it.