A 42-year-old patient complains of pain in the submaxillary and sublingual areas that is getting worse during eating, body temperature rise up to 37,6°C. He has been suffering from this for 2 months. Objectively: infiltration along the right sublingual torus, hyperemia, soft tissue edema, acute pain during palpation. The duct of the right submandubular salivary gland excretes turbid saliva mixed with pus. What is the most probable diagnosis?