Actually Magic Fields is available in 3 languages if do you want use magic fields in one of this languages just download one of the files below:
Uncompress the file and create a folder called lang inside of the magic fields folder and put there the .mo and .po files.
And just for finish, in your wp-config.php localize this line:
define ('WPLANG', '');
and replace it in function of which language do you want. for example.
And its all.