Use correct title for Beta Opt-in page

services/web/app/coffee/Features/BetaProgram/BetaProgramController.coffee

@@ -24,6 +24,6 @@ module.exports = BetaProgramController =
 				logger.err {err, user_id}, "error fetching user"
 				return next(err)
 			res.render 'beta_program/opt_in',
-				title:'beta_program_opt_in'
+				title:'sharelatex_beta_program'
 				user: user,
 				languages: Settings.languages,