Send better error messages for 'ValidationError's #225
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Provide better messages on the error pages for some validation errors.
Some of these shouldn't be reachable through the website so aren't that important, but ones like "Sum of file sizes exceed size limit when syntax highlighting applied" are good feedback to get as the reason for failure isn't otherwise clear. (PR inspired by a user on Python Discord wondering why they were getting a 400 error in this case)