edit-copy ID is already used by contact.module and breaks XHTML validation

Hello, the edit-copy ID used by l10_client module in his form is already declared in form of contact module and that breaks the XHTML validation when these two forms are in the same page.

So i have made a little patch to change id of form elements to avoid this problem (this patch contains also the http://drupal.org/node/361147 patch which adds textgroup support)