The SpolszczenieCenegaPlusMobileFontFixed folder should be placed in the modloader folder,

or you can enter the SpolszczenieCenegaPlusMobileFontFixed folder and replace the files in the root folder of GTA SA
so that it works with MTA or SAMP, as some multiplayer mods don't work with .asi or Cleo files, but the localization itself works without the .asi file.