In English, "one" can be used both when counting (1, 2, 3, 4, 5, ...) as well as an atricle in front of a nouns (one tree, one bridge, ...). In German the two use cases are distinct. "One" as in counting is "eins, zwei, drei, vier, ...", but as an acticle it would be "ein" (for male or neutral nouns) or "eine" (for female nouns). Thus in the text the correct term would be "eins" in German.

For the French counting, "une" is not quite correct.  It is the female form for "one" as an article.  It is much more common to count "un", "deux", "troix", "quatre", "cinq", ....

pkgs/racket-doc/scribblings/reference/hashes.scrbl

@@ -594,7 +594,7 @@ key @racket[k] and value @racket[v], if a mapping from @racket[k] to some value
             (make-immutable-hash '([2 . two]))
             (make-immutable-hash '([3 . three])))
 (hash-union (make-immutable-hash '([1 . (one uno)] [2 . (two dos)]))
-            (make-immutable-hash '([1 . (ein une)] [2 . (zwei deux)]))
+            (make-immutable-hash '([1 . (eins un)] [2 . (zwei deux)]))
             #:combine/key (lambda (k v1 v2) (append v1 v2)))
 ]
 
@@ -623,7 +623,7 @@ h
 (hash-union! h (make-immutable-hash '([1 . (one uno)] [2 . (two dos)])))
 h
 (hash-union! h
-             (make-immutable-hash '([1 . (ein une)] [2 . (zwei deux)]))
+             (make-immutable-hash '([1 . (eins un)] [2 . (zwei deux)]))
              #:combine/key (lambda (k v1 v2) (append v1 v2)))
 h
 ]