There is no consensus right know on how to translate "gesture" in Italian. Some keep the English word, some use the Italian word "gesto". However, such translation is not intuitive in my opinion because "gesto" in Italian means action. Traccia, on the other hand, means "trace" or "track", making the task to do way easier to understand. "Di sblocco" means "unlocking".

I partially agree, but I'm afraid 'Traccia di sblocco' might be a little too lenghty in this case. Samsung uses the term "Segno" for their devices (https://www.samsung.com/it/support/mobile-devices/metodi-di-blocco-disponibili-nei-telefoni-galaxy/)