the waiter cannot become a Senior Waiter , they can only become a chef

I switched the game language to Japanese but the currency is still in dollars. Needless to say, this is very confusing. I see screenshots of people playing the game in yen + English language, can someone help me about where to change this? 日本語に設定を変えてもお金の単位はドルのままなんです。助けてください。T_T...