smsu: check message length in javascript and block sending if too long
smsu: check message length in javascript and block sending if too long

fixes regression introduced in commit

    Date:   Mon Jun 11 15:04:58 2012 +0000

    smsu: do not check the length of message in java, better rely on broker check + javascript check

javascript check was only displayed in red color, but was not blocking sending

git-svn-id: ff983b4bcb2c7e6a7cb4f1ce831626e7b8f8ab18@421 fc430c36-7b06-4524-a305-defe264b8bfe

EsupPortail/esup-smsu,EsupPortail/esup-smsu,EsupPortail/esup-smsu