Updated Polish Translation

Updated Polish trnaslation to the latest .pot changes.
Default screenshot changed to OSD

Two reasons:
1. On some boxes video grab does not work.
2. I think that this function is mainly used to control the box. In OSD
mode it works faster.
Support for some SH4 boxes

Added support for some SH4 boxes in "About" page: description and
images.
Merge pull request #223 from mickeyreg/master

Update of the Polish translation and list of supported SH4 devices.