Translation of Krankenpflegerin

Will you be online in 1 hour? I saw your translations and had some comments: rainbow is it 'arco iris' or one word arcoisris? Usually all words appear lower case. Sometimes it is uppercase. It all depends.
Maybe we would need to say install our dictionary as a software? But I would say instead of install, use our dictionary as a software. So bottom line. If I use the singular form for newsletters and websites, I am on the safe side for both?
Now I am married and I work as a computer scientist at the University of Heidelberg. I have a daughter and two sons. Now I am saying goodbye and I will wait for your message on Vocabulix.