The generic error screen that is shown when an error occurs during loading only says "An error occurred". We need to show them something more meaningful.
Please find specs in [[ https://www.figma.com/file/KIkcQ7NjOl8OkQtGWe5duIbW/Wikidata-Bridge?node-id=3638%3A1126 | this Figma artboard ]].
[ ] generic error message is shown as in mock-ups whenever there is no specific error available
[ ] "report an error" link leads to a "create new task" page on Phabricator with Bridge tag filled in
[ ] can be configured to some other system for 3rd-party installs
[ ] if the reporting system doesn't support submitting details in the link then that can be omitted
[ ] include information necessary for debugging - e.g. stacktrace in the prefilled task form link (make sure first it doesn't reveal private information)
[ ] the message of the internal error object is shown
[ ] track the number of times each error is triggered
**Template for report:**
Title: Wikidata Bridge error on loading
The error happened on: $articlename, $wikiname <- could also be $articleURL, whatever is easier
Error message: $errormessage
Debug information: $stacktrace <- potentially shortened?