I suspect the problem is that you are using EnglishUK in TMG but EnglishUS in Second Site.

If you have the language set in TMG on the File > Language setting to EnglishUK, then the sentences you edit or create will by default be the EnglishUK sentences, not the EnglishUS ones.

If you make your site with the Sentence Language set to EnglishUS it will not use those EnglishUK sentences. Changing the Sentence Language in Second Site, as I believe you did, should fix that.

Terry Reigel