It was a bit awkward using `mgmt run lang --lang <input>` so instead, we now drop the --lang, and read the positional argv for the input. This also does the same for the --yaml frontend.
It was a bit awkward using `mgmt run lang --lang <input>` so instead, we now drop the --lang, and read the positional argv for the input. This also does the same for the --yaml frontend.