Forms validation not working

Problems and solutions
1

The form validation framework in my preside app doesn’t work.

What I do:
I have a form.xml with a field definition
<field name="title" sortorder="0" control="textinput" required="true" />

I render the form in my view:

#renderForm(
   formName            = "newsfeed.edit"
 , context             = "website"
 , formId              = "editPM"
 , includeValidationJs = true
 , fieldLayout         = "newsfeed.fieldLayout"
)#

I see, that the rules are generated:

<script type="text/javascript">
			( function( $ ){
				var validator = $('#editPM').validate()
				  , options   = ( function( $ ){  return { rules : { "title" : { "normalizer" : function(value) { return $.trim(value); }, "required" : { param : [] } } }, messages : { "title" : { "required" : "Erforderliches Feld" } } }; } )( jQuery );

				validator.settings.rules    = $.extend( validator.settings.rules   , options.rules    );
				validator.settings.messages = $.extend( validator.settings.messages, options.messages );
			} )( jQuery );		
</script>

But the validation doesn’t work. I can just submit the form. What am i missing here? Looks like a .js is missing (where I thought it is automatically included when includeValidationJs = true is set).

Any advice here?