fix for email address check Chinese version
Merge pull request #8 from flyingice/master

fix for email address check Chinese version
change modal tell to better deal with empty user input
change modal tell to better deal with wrong input
avoid creating duplicate entry in destination_subsciption table&user subscription when filling preference
force email not empty & email validation at front end
share the same alert modal
overlapped modal
code cleanup
Chinese version update
Merge pull request #9 from flyingice/master

DB update bug fix + UI update
move email check to server side
Merge pull request #10 from flyingice/master

move email check to server side
clear email input at submission time
Merge pull request #11 from flyingice/master

clear email input at submission time