Add language line.

resources/lang/en/validation.php

@@ -35,6 +35,7 @@ return array(
 	"digits"               => "The :attribute must be :digits digits.",
 	"digits_between"       => "The :attribute must be between :min and :max digits.",
 	"email"                => "The :attribute must be a valid email address.",
+	"filled"               => "The :attribute field is required.",
 	"exists"               => "The selected :attribute is invalid.",
 	"image"                => "The :attribute must be an image.",
 	"in"                   => "The selected :attribute is invalid.",