* TemplateSaveError -> CardTypeError
* Don't show success tooltip if export fails
* Attach help page to error
Show help link if export fails due to card type error.
* Add type (dae)
* Add shared show_exception() (dae)
- Use a shared routine for printing standard backend errors, so that
we can take advantage of the help links in eg. the card layout screen
as well.
- The truthiness check on help in showInfo() would have ignored the
enum 0 value.
- Close the exporting dialog on a documented failure as well
* Fix local variable help_page
Once the mutex has been poisoned the app is unusable, and users were
struggling to close it. This also ensures we'll receive the original
error report, instead of the follow-up poison errors that don't tell us
what caused the issue.
https://forums.ankiweb.net/t/error-message-keeps-popping-up/10494
this works around the issue Pontoon has with saving translations with
trailing newlines, and makes it easier for translators to update in
the future, as the errors are now using markdown
