I think that depends entirely on whether Stainless Steel 4.1 works with the german version. My instinct says that it does, but I don't have a non-English version of the game, so I don't know for sure. I think that at worst it would simply make the in-game text display in english rather than german, but that it would otherwise work properly. If you could deal with the game text being in english, you would probably be ok.
My suggestion would be to make a backup copy of your entire M2TW install folder. Just hit copy when the folder is highlighted, then his paste to create a duplicate of it (this will take up a lot of HD space). Then install SS 4.1 over the top of your german version of M2TW and see if it works. If it does not, you can just delete folder with SS 4.1 in it and rename the duplicate copy folder to the original folder name and the game should work properly again.
That said, we have a lot of people in LotR who do not hail from nations with English as a primary language. Perhaps some of them will have more information on how well SS 4.1 works with other versions of the game.
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