Verb conjugation of "grumble" in English

I wanted to tell you that we have uploaded a successful version (with Peter). In Annex I send the profile. It is very similar to the last version, just a few words less in each lesson.
Thank you for your email! A little question about yourself. How old are you? I think the Americans are using the word color and not colour, but I understand if you are not sure about it.
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.