Your best bet would be the error logs, although I do see the problem, I have no clue on what might be causing it. Blank pages in wordpress are normally caused by some php error, but there is no reason what so ever that it will work on one language and not on another.
Bet yako bora itakuwa magogo kosa, ingawa mimi kuona tatizo, Sina fununu juu ya nini kinaweza kusababisha. Kurasa tupu katika wordpress ni kawaida unaosababishwa na baadhi ya makosa php, lakini hakuna sababu gani hivyo milele kwamba itakuwa kazi juu ya lugha moja na si juu ya mwingine.