[*] TR : Fixed wrong use of translation functions

In AdminTranslationController there was a problem with the use of Tools::displayError()

It led to the controller displaying the following error to be translated (which is nonsense):

The server does not have permissions for writing.'. ' '.sprintf(Tools::displayError('Please check rights for %s

Instead of:

The server does not have permissions for writing.

and

Please check rights for %s