* addresses comments for https://github.com/LLK/scratch-www/pull/1900
* renames report fields to match scratchr2 expectations
* restyle modal to allow display of validation messages
* removed cruft
* move all the report modal presentation into the component
* add strings to general l10n file because we don’t handle l10n files in components
* Add current project id and username to the data before submitting
Report button opens a modal with the report project form. All the content is currently in `preview/presentation` because components cannot have their own l10n files.