Contract

On recommendation from my bank who went through all the papers about my flat, I asked for a translation of the actual contract to English. They complied, and on Friday I got it (later left in pub but luckily retrieved if you remember). Read through it today, and realized I'm gonna need some help interpreting the legalese. It ain't easy. But one clause states "If the execution of completion of the buildings is delayed by acts of God...blablabla"...HAHAHA! By acts of whom?