Accented characters are broken in OS X

I use both Ogg Vorbis and FLAC for my music collection, ripping CDs to FLAC and then reencoding to Vorbis for my portable player. Things work well until one day I decided to tag a French CD that has accented characters.. I tried explicitly saving the tag file in UTF8 using TextEdit, but the tags become corrupted (I get ## instead). If I try listing the tags (using vorbiscomment -l , ogginfo or metaflac --list) of a file tagged in Linux, I get for example the following:

    comments: 10
    comment[0]: REPLAYGAIN_TRACK_PEAK=0.97973633
    comment[1]: REPLAYGAIN_TRACK_GAIN=-6.96 dB
    comment[2]: REPLAYGAIN_ALBUM_PEAK=0.99316406
    comment[3]: REPLAYGAIN_ALBUM_GAIN=-7.03 dB
    comment[4]: title=Reste l`a
    comment[5]: artist=Keren Ann
    comment[6]: genre=Alternative Folk
    comment[7]: date=2000
    comment[8]: album=La biographie de Luka Philipsen
    comment[9]: tracknumber=07

Note that the Reste l`a is supposed to be Reste là ..