Updated thank you messages

Change-Id: I231a1639350b50969e5b9b567c2d057ffb276b87
Better translations for he and ro

Change-Id: I32897fd9ca14fc67dc5c9ad08d93418d84c07c43
Improvements for Thank You

* Templates now
** use contact ID instead of contribution ID
** are pretty printed

* Thank you itself now correctly uses the List-Unsubscribe header

Change-Id: I7f59ccae3b774e72f7f21db3c7ee4ad83619a20a
Updated translations w/ pretty printing and contact_id

Change-Id: I24c6dacbee7c2bbd8e2a94ae28d6f5ef7abfe5d8