Is some cache affecting somehow the results?, as I have done what you suggested and it does not change.
I am enclosing two images, the first of the admin backend with the translation done and the second of the front end where it does show it hasnґt changed.
In case you want to take a look the foont is:
planificanet.gob.mx.temp.realssl.com/index.php?option=com_content&view=article&id=18&Itemid=20
and the backend is:
planificanet.gob.mx.temp.realssl.com/administrator/index2.php?option=com_ariquiz&hidemainmenu=1&task=flang_add&fileId=16
the admin login is
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p: ***