Translation of felicity in Spanish

I remember that after highschool I went to study English in New York. First I did not know whether the city was right for me cause I wanted a place where I would not feel lost. However, it was the right choice.
I wanted to ask whether you would like to help in another English - Spanish project. The dictionary has around 10,000 -20,000 entries and many of them do not have sample sentences. We need to add sentences to give users more background.
My daughter and her husband have invited me today, it is always very nice to visit them. There were many friends there too, because it was my grandson's birthday. We were very happy and celebrating.