Reverted UK->US spelling changes

Keeping both spelling styles in play for now, as discussed.

Update/onik_003.txt

@@ -226,7 +226,7 @@ void main()
 //　あとはいつものノリだった￥
 	if (GetGlobalFlag(GADVMode)) { OutputLineAll("", NULL, Line_ContinueAfterTyping); }
 	OutputLine(NULL, "　あとはいつものノリだった。",
-		   NULL, "The usual hijinks ensued.", Line_Normal);
+		   NULL, "The usual hijinx ensued.", Line_Normal);
 	ClearMessage();