[javascript] fix loadRemote implementation for synchronous requests In case of synhronous requests, loadRemote is supposed to return the "interpreted" server result (e.g a json object, a DOM object, ...). $.ajax() always return the XHR object, so we have to use the success callback to capture the actual server result and return it later.

[js preferences] fix various pb with js for preferences form: buggy clearPreviousError, bad prototype of callbacks given to validate form, dunno how error display was expecting to work...

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