Tiny inconsistency between 'between' and 'digits_between' validation rules messages

Even though `between` and `digits_between` validation rules are pretty much the same, they do have a small difference: `between` uses `-` for the range, while `digits_between` uses `and`.

**between:** `The :attribute must be between :min - :max.`
**digits_between:** `The :attribute must be between :min and :max digits.`

I know this is really no big deal, but it does look nonconforming when you look at both errors side by side, on your website. I was thinking maybe we could decide which is better and just change the other.