Enable passing alert message type.
Extract place message form into BackboneJS template.
Remove deprecated HTML form.

+ Form was added in 81ec54d6e93680e5106e151c384b2fb2a0ee83e3.
Remove deprecated method in message controller.

+ Moved into API before, see commit 08d5d6859fab22c95aaa736e5c9995bf4ae5cf16.