Fix email sender
Closes #372 (closed)
What does this MR do?
- Fix renaming typo in EmailGateway (nearly a year old...)
- Do not apply strip_tags to message/subject
- Properly convert HTML to Plain for plain part of message
How confident are you it won't break things if deployed?
local test was fine
Links to related issues
- 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))