@Michaela97
It does not sound like spam. Your guests are coming from the other side of the world and dealing with a clear language problem.
Google Translate is far from perfect and at times can make communication worse,rather than better. I speak Spanish and some of the translations are indeed a laugh.
With your communication write small sentences and with basic language...Google Translates them better than sentences with complicated grammar or word structures. It may read somewhat simplistic but the idea is to be understood and friendly.
Reassure them that everything will be ready for them and you will indeed be there to meet them etc
Here is a guide to Prague in Spanish you could maybe attach ...there are others via Google
https://www.prague.eu/file/edee/universal/download/brozury/praha-do-kapsy-2017/es.pdf