- Add base Service for issuables export
- Extend IssuableExportCsvWorker to be reused with
requirements
- Fix email templates to use size_limit
- Add email preview for #requirements_csv_email
- Add specs for #requirements_csv_email
- Update PO files
- Fix mailer preview

Rescue RecordNotFound error in worker

- Rescue and log RecordNotFound errors raised
by user or project missing in
IssuableExportCsvWorker
- Modify specs to reflect this change