There’s a much easier way which I’m currently using.
You can’t change the language inside the game settings. But in the Blizzard Battlenet Launcher click Warcraft 3, then the little options button above the video and there on game-settings. Select the game you want to change and change the language settings. It does need another 2.2 GB data but that is a lot less than a full re-install. And if you have a slow connection like me, that’s important.
Hope this helps the next ones looking for a solution
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