Translation of wechselhaft

On the other sites I work with every 3 to 6 months developers are called together to exchange experiences. Everybody is kept up to date and new projects are introduced. It is good for workflow.
In plural there is no difference between the formal and the colloquial address form. Do you mean that you are using 3rd person singular form for the plural imperative? If so, I will change all entries so far.
That's a great deal. I know that in the beginning it is difficult to have conversations, especially if you're not stable with vocabulary. Actually, your English does not seem so bad. Have you ever taken a course?