Fix some bits in the email top the consultant

[ale-rt]

@reinhardt this PR fixes the mail text that is sent out in current master. As you can see, the HTML email is sent as text. The purpose is to convert back the entities to characters.

Also it removes the meta:interpolation which is not needed.

[reinhardt]

It's not an HTML mail though, but text/plain. #538 changed the quotes to be utf-8 characters instead of HTML entities. So if we want an HTML mail we need to change that back and also change the mime type, right?

[ale-rt]

Never mind