search the menu using input box (#1317)

* working version

* change onchange to oninput with minimum of three chars

* working version with delay and fix for category click

src/main/resources/i18n/messages.properties

@@ -54,6 +54,7 @@ sign.in=Sign in
 register.new=or register yourself as a new user
 sign.up=Sign up
 register.title=Register 
+searchmenu=Search lesson
 
 
 not.empty=This field is required.