Error in error message from validateLength in Control class

[flasica222]

Actual behavior:

• If the criterias are not met for minlength or maxlength an error is thrown with a message error defined in Element.php
• The error thrown is: Unknown variable '$' in error messge.
• The message is: "Please use at least {@minlength} characters for this text (you are currently using {$length'} characters)"

Expected behavior:

• No error should be given when displaying the error message.

Description:

1. Create a Textarea
2. Use validation for minlength/maxlength but don't respect the condition imposed by the validation