I've said this before and I'll say it again.
8 Intelligence doesn't make you a simpleton unable to form complete sentences. This is a thing that several crpgs decided to do, but it's not a thing in 5e DnD, or in 4e, or in 3e.
Just as a comparison, the lowest threshold for sentient creatures, for being able to speak, is 3 Intelligence. Having 8 Int just means you're a bit of a dumbarse, and plenty of people these days go through the world being dumbarses while being able to speak just fine.
