loginButton Update login.php

the "loginButton" valule had no translation when changing languages.

application/views/login.php

@@ -42,7 +42,7 @@
 					}
 					?>
 
-					<input class="btn btn-primary btn-block" type="submit" name="loginButton" value="Go"/>
+					<input class="btn btn-primary btn-block" type="submit" name="loginButton" value="<?php echo $this->lang->line('login_go')?>"/>
 				</div>
 			</div>
 		<?php echo form_close(); ?>