updated welcome copy
update states_language
update timeout msg
update compliment msg
update complaint msg
update faq question
update thank you message
update opt-out start state
update question_1_friendliness
update waiting time
update cleanliness
update privacy
update thank you msg
update rating sms
use context variable
Merge pull request #78 from praekelt/feature/issue-78-update-copy

Update public, opt-out and service rating copy