There are 4 sets of prop Hydra signs in the Captain America: The First Avenger Auction — lots 186-189. The signs are written in German. But curiously enough, there are obvious misspellings. For example, lot 186 shows a large wooden signed emblazoned with “SPERRGEBEJT.” It should really be spelled “sperrgebiet” (restricted area). “KEJN EJNTRJTT” should really be “kein eintritt” (no entry).
Lot 188 is a set of four Hydra signs, each with “KREIGSGEFANGENER” written at the top. That is also misspelled and should read, “kriegsgefangener” (prisoner of war).
Finally, lot 189 is another set of four Hydra signs, two of which has “ARBEJTSBEREJCH” at the center. The correct spelling is “arbeitsberg” (labor mountain).
Given the meticulousness and precision of the other props and costumes in the film, it’s difficult to believe that the prop-makers would be so careless with this aspect. Judging from the vehicles, like Hydra Schmidt’s Coupé and Hydra tank, to lab equipment, like the Rebirth Pod, it is apparent that they spared no expenses and were deliberate in all elements of production. So it is almost unfathomable that they did not do proper research on something that could easily have been verified with Google Translate.
The only conclusion that I could arrive at is that the misspellings were, in fact, deliberate. The reason could be that they did not want these props to be construed as the real thing or replicas of the real thing. Hydra is fictional, but Nazi is still very much a taboo. (I believe it is illegal to sell any Nazi memorabilia.) My guess is that the filmmakers wanted to maintain realism and a connection to historical events, yet still remind everyone that this was make-belief. Switch the “I” for a “J” and transpose the “E” and “I,” particularly for words that might evoke outrage — “restricted area,” “prisoner of war,” and “labor mountain” — and they have diffused potential controversy.
That is if seeing the lead villain as a guy whose head is literally a red skull doesn’t tell you it’s make-belief to begin with.