Poll mailer improvements (loomio#6667)

* added proper 'from'

* add group name to poll mailer subjects

* oops

* don't repeat "results" header

* add "Results" header to time poll chart

* add results header to ranked choice chart

* replace poll type specific translations with 1 set of generics

* ok

* fix

* fix meeting time chart in email and export

* fix specs

* fix missing helper reference

Co-authored-by: Robert Guthrie <[email protected]>

version 2.2.1

version 2.1.12

Merge branch 'master' ot push origin master:wqf github.com:loomio/loomio

dont link user avatar in mailers

update locales

2.1.6

2.1.5

use old poll names for now

make this look a bit nicer