Permanent timeshift for Vu+ Duo

[Dexa]

* Fixed Shift + Radio = Instant Record Button not working anymore on DM800.
* Fixed Timeshift getting activated on channel-zap again when record is running.
* Added Polish translation-files (Thx Maciek).

I've found that rewind is working on this release without having to pause first. Tested using VTI 1.3.

Simply FTP to the box ipk to / tmp

install via VTI panel -> ipk / tar.gz installer

or install via telnet:

ipkg install / tmp / *. ipk