Feature/split forms to reduce complexity#320

Created by: wasabideveloper

Implementation of refactoring #320 (closed) (Merge will close #320 (closed) and will close #325 (closed) ).

• locales NOT compiled -> do this on release (prevent huge locale diffs in changes)
• ran tests
• ran e2e tests
• tested views by hand:
  • /orders/new/new_excerpt [get/post]
  • /orders/new/existing_excerpt [get/post]
  • /orders/
  • /orders/{id}

Please pull the branch and run it locally. I would be sure my huge changes are really running before I merge the develop.

To do:

• Test refactoring locally. To be reviewed by:
  • @das-g
  • @hixi
• Merge develop (containing huge refactorings) [@wasabideveloper]
• Test again [@wasabideveloper]
• Merge & close branch