Feature/pt/303 role for pass gen

Closes issues0#303

What does this MR do?

it adds a new role to the string selection for the passports

How confident are you it won't break things if deployed?

pretty much

Links to related issues

https://sentry.io/share/issue/51ce40b4077d41dea1c332cdc1fd15f6/

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))