Most people don't use the mature filter for language, particularly if it's just average level swearing. It's also worth noting it's a per episode thing, it's not like the entire comic gets put in a mature section. You just mark the relevant pages. It should have very little effect on views.
I suggest noting in the story description "rated mature for language" and not worry about the mature filter unless it's more extreme or hateful language.
I hope that helps!