Backing Answers with an ActiveRecord Class #15761982861259 #15717558064448

- persisting answers
- preserving answer form content in request/offer show
 - displaying answer list in request/offer show for the owning user
Merge commit
Some answers styling. locales fix. Needs answers refactoring.
Answer are rendered via partial. #15761982861259
Added missing localization. #11592945483683
Merge branch 'dev'