fixed categories
Properly test mail delivery
Add from field to comment notification mail
admin article link
Set default for comment notifications to true

This also sets it to true for all users
Merge branch 'develop' of github.com:fairnopoly/fairnopoly into develop
Usability fix: Redirect to libraries page when deleting library element
Merge branch 'master' into develop
Use string interpolation for mail view

This avoids NilClass errors
Merge pull request #979 from BiteKollektiv/set-comment-notifications-defaults

Set default for comment notifications to true instead of false
Merge pull request #978 from BiteKollektiv/add-comments-mailer

Possible fix for failing comment notification mails
fix last pull request merges and refactor email defaults
another fix for comment mailer
HOTFIX - error notice styling
Merge branch 'master' into develop
changed email structure in email_addresses.yml.example
enable link to library in comment mailer
Merge branch 'develop' into feature-borrow
articles are not commentable when the seller is on vacation