What's wrong with?
- We were talking [about] the English Language!
- Let's talk football!!!;-) - Very colloquial, and I don't particularly like it. There's nothing wrong with "Let's talk about football".
There's nothing wrong with those (well, apart from the missing "about" in the second sentence).
I said that we usually use "speak" when the verb is followed by the name of a language/number of languages.
We speak Spanish.
They speak German.
We speak four different languages.
We are talking about speaking English.
They are talking about speaking German.
He was talking about last week, when he was speaking Italian all week!