laravel/application/lang/en/validation.php

<?php 

return array(

	/*
	|--------------------------------------------------------------------------
	| General Validation Messages
	|--------------------------------------------------------------------------
	*/

	"acceptance_of" => "The :attribute must be accepted.",
	"confirmation_of" => "The :attribute confirmation does not match.",
	"exclusion_of" => "The :attribute value is invalid.",
	"format_of" => "The :attribute format is invalid.",
	"inclusion_of" => "The :attribute value is invalid.",
	"presence_of" => "The :attribute can't be empty.",
	"uniqueness_of" => "The :attribute has already been taken.",
	"with_callback" => "The :attribute is invalid.",

	/*
	|--------------------------------------------------------------------------
	| Numericality_Of Validation Messages
	|--------------------------------------------------------------------------
	*/

	"number_not_valid" => "The :attribute must be a number.",
	"number_not_integer" => "The :attribute must be an integer.",
	"number_wrong_size" => "The :attribute must be :size.",
	"number_too_big" => "The :attribute must be no more than :max.",
	"number_too_small" => "The :attribute must be at least :min.",

	/*
	|--------------------------------------------------------------------------
	| Length_Of Validation Messages
	|--------------------------------------------------------------------------
	*/

	"string_wrong_size" => "The :attribute must be :size characters.",
	"string_too_big" => "The :attribute must be no more than :max characters.",
	"string_too_small" => "The :attribute must be at least :min characters.",

	/*
	|--------------------------------------------------------------------------
	| Upload_Of Validation Messages
	|--------------------------------------------------------------------------
	*/

	"file_wrong_type" => "The :attribute must be a file of type: :types.",
	"file_too_big" => "The :attribute exceeds size limit of :maxkb.",

);