several changes for packaging

removes psyco import strings (caused crash, if psyco was installed)
marks some strings for translation
adds russion translation
removes System selection possibility from songeditor

because users would except that changes can be saved but because of the system permissions of Linux/Unix systems that does not work
fixes bug in song-browser,

that made next and prev button not work, if you switched to other location with no songs in it.
fixes path recognition that could cause crashes in the filedialog of csg