We checked to see if any of the not so common languages were supported when displaying foreign subtitles. We selected Greek (see the screenshot below) but unfortunately it was all Greek to us! Whic probably means that it won't support any of the Cyrillic based languages either.

While a movie plays, the viewer can get what is admittedly rather limited information, such as the track elapsed time or track remaining time, by pressing the display button.

No other, additional information is provided (for example, the current file name, possible audio tracks or available subtitles).

By pressing the display button one more time, all display info is turned off

The viewer can also identify various audio tracks and subtitles only by pressing the corresponding Audio/Subtitles buttons.