Je parle gallois.
Here's a breakdown:
* Je: I
* parle: speak
* gallois: Welsh (the French word for the Welsh language)
You can also say:
* Je suis gallois. (I am Welsh) - This implies that you are a native speaker of Welsh.
* Je parle la langue galloise. (I speak the Welsh language) - This is a more formal way of saying it.
It's important to note that "gallois" is pronounced with a silent "s" at the end, like "gal-lwa."