I consider typos to be bugs, although very minor, as you said. As for the triviality:
Nevertheless, I think “typos” as a category is pretty well-defined, so we can exclude them from receiving medals from now on.
To be clear:
Reports of typos are still welcome, and desired. They are part of the polish of the final product, which is very important for me.
“Typos” are limited to capitalization, spelling or grammatical errors. Anything beyond that can still potentially receive a medal (even something as simple as e.g. renaming “Heroes’ Medal” to “Medal of Heroes”). Also, typesetting errors (wrong justification, text overflows outside button, etc.) can still receive medals.