Yes—Trojan Killer supports multiple interface languages. Open Settings → Language and switch anytime; this changes the UI only (protection quality is identical). If your language isn’t listed and you’d like to help translate, let us know—volunteer translators receive a free key as thanks.
Available languages: English; Português Brasileiro (Brazilian Portuguese); Nederlands (Dutch); Français (French); Deutsch (German); Polski (Polish); Русский (Russian); Slovenščina (Slovene); Español (Spanish); Türkçe (Turkish); Українська (Ukrainian).