I have noticed for some time now that unicode characters in titles or descriptions has very poor kerning on the PS3 client. It looks as though an extra space is being padded after each of these characters.
I have a number of files with either Russian filenames/titles or with Russian descriptions, and the Cyrillic characters have this unusual kerning. On a more mundane note, it seems that even the common apostrophe character (i.e. ') has the poor kerning as well.
I realize it’s possible that this is could be intrinsic limitation of the PS3, in which case the Plex client can’t do anything about it.