Admin UI add client side validation/limit characters on textareas

When submitting a form (e.g PushApp registration or edit form) and the textarea contains more than 255 chars, an exception occurs on the backend side since the value is larger than the column length:

e.g: org.h2.jdbc.JdbcSQLException: Value too long for column "DESCRIPTION VARCHAR(255)"

The error message which appears on the screen is: "Current Error: Error Saving".