add language selection to sign up form; add greek locale
fix missing translation
Merge pull request #850 from loomio/language-selection

add language selection to sign up form; add greek locale
fixmigration
remove phase and refactor motion close_at

fixes #569
Merge remote-tracking branch 'origin/refactor/remove-phase-and-fix-close-date-issue' into feature/change-comments-from-polymorphic-to-normal

Conflicts:
	app/models/discussion.rb
	db/schema.rb
	extras/queries/visible_discussions.rb
ok gettin there