<handy translation of above>
"I have long noticed that there are not enough sounds in the game, I thought that this was because the game was still in development. However, in the new version of the game even those sounds that were in the old one disappeared.
I began to look at what was in the game file (desktop-1.0.jar) and found there a folder with many audio files. Some files were played, some not. I began to look at the properties of the files and found that those files that could not be played were recorded in mono, 1 channel. Stereo files played without problems. I tried converting 1 channel files into 2 channels and inserting them back into .jar. And, lo and behold, the game was filled with sounds!"