Can't select Mailing Template in CiviMail after upgrading CiviCRM to 4.7.30
This is a bug in 4.7.30. See CRM-21759. There is now a patch for it, or you can wait for 4.7.31.


  in 4.7.30 there is a call to a non existent angular templates file. This means that the Message Templates section of a new mailing doesn't load.