* Adapt the code for the new information returned by read()
* Display a warning if there are more than 1 file in the torrent
because the add-on will play only the first file
* Manage the error use case when calling write()
* Remove the "start downloading" notification since an equivalent
message is now displayed by vfs.libtorrent
While adding the German translation some encodings errors occurred due
to non-ASCII characters. Only these errors were fixed because a full
analysis of the strings will be performed when implementing support for
python3.