Found root pack 'D:\Games\FreeSpace2\fsport\fsport-str-voice.vp' with a checksum of 0xe72dc0dc
This belongs in fsport-str, not fsport.
Found root pack 'D:\Games\FreeSpace2\fsport\stu_fs1.vp' with a checksum of 0x060994cb
The checksum of this file is incorrect. Download it again from the release thread.
Found root pack 'D:\Games\FreeSpace2\fsport\tango_hi_fs1.vp' with a checksum of 0x44e81e9f
Delete this. If you still want high-resolution CB animations, get the newer ones from the release thread.
Found root pack 'D:\Games\FreeSpace2\Root_fs2.vp' with a checksum of 0x95939bdc
I don't know if this is because you have the Polish version, but this file also seems to have an incorrect checksum. (Just in case, download
this and extract the Root_fs2.vp file to your FreeSpace2 folder. You might want to back up your current Root_fs2.vp.)
As for the language, you can change it to English by following
these instructions (assuming you're using Windows). They're under "How do I change the language settings for FS2 - The retail launcher won't let me?"