- Action to split subtitles in several files, for too long videos.

- Add "What's this?"

- Check spelling on all subtitles

- Choose to extract from DVD or from VOB files
  (subtitles: tcprobe -H 10 -i <dvd_device> -T <title_number>)

- Filters to fix tipical errors of OCR conversion.

- Bug on changing a subtitle not modified (it's a bug of KTextEdit, with check spelling enabled)
