Fix Facebook Import Character Encoding (Hungarian/Special Characters)

I want the Facebook import tool to correctly decode special characters (like the Hungarian alphabet) from Facebook's JSON export. Currently, characters like 'á' are exported by Facebook as '\u00c3\u00a1' and SAGA imports them as 'á' (mojibake). This makes the contact list garbled and difficult to use for non-English names. It is important because it prevents me from properly managing my Hungarian contacts.