Dictation Broken Across entire IOS7.1 Platform
I would also try turning off and then back on siri to see if tha fixes it. I remember I had to do this a few times when iOS 7.0 was released to the public.
Oh yeah that happened to a friend of mine. It put instead of the spanish for hello how are you, something like she has purple feet came out in the text field. so yeah check that and see if that does anything, the language thing anyways.