Will past medschool failure history affect Graduate admission in Literature/Linguistic major?
Your past career as a medical student was so long ago that it might as well have been someone else. I doubt that a grad school in your current field will still hold you liable for problems you experienced much earlier in life, especially given your accomplishments since then.

If you are concerned enough to mention it as part of your application, then just make sure to comment about why you believe it’s not relevant to who you are today and why schools shouldn’t worry about a repeat episode. Of course, you can point to your current record as proof of the change!