Basically. People would usually download a Pirated Version of PVZ, and probably delete it sooner or later. Then, after buying the game on steam, they would realize that the Wave Begin sound and all of the zombies "Braaaaaainzz" voicelines are all in Russian.
Me being one of the "many" people that got this issue, tried looking for a fix online, but to no success.
So naturally, i tried fixing it myself, and actually found a solution to it!
So now, for the 0.2% of people on earth that had/still have this issue, this guide is for you!

Fixing this small, yet annoying little thing in PVZ is actually rather simple.

All you gotta do is replace the old Russian sound effects with the Original ones.
To do this, you will need all of the OG sound files, so for the ppl that dont want to go out unpacking the files and risking their PC's, i made a neat little google drive with all the .ogg sound effects you'll need:

https://drive.google.com/drive/folders/1CYV6-2HIi4FOMNeOYmSGq9_KRL11Ksso?usp=drive_link

• Step 1:

Download the sounds folder

• Step 2:

Put the sounds folder in your root directory

• Step 3 (Optional):

You just need to boot up PVZ and check for yourself if the zombies are speaking russian, and if not, then you can go back to your PVZ root directory and delete the folder, or not, you can just leave it there if ya want to.

And yeah thats about it :D