Pilot reported a near mid air collision with an aircraft while in the traffic pattern and landing. The Pilot took evasive action and rejoined the pattern and landed.

Narrative

As I entered left downwind for Runway XX [at] ZZZ I saw an aircraft departing Runway XX. I heard a mumbled radio call and was able to make out 'departure'. The aircraft turned left and I heard another mumbled call and was able to make out 'crosswind'. I then saw the aircraft heading toward me and it seemed to be gaining on me rapidly.I had made a call 2 miles NE of the [landmark] followed by another call directly over the [landmark]. I also called downwind. All my calls included 'aeronca' so other aircraft could appreciate that I would be slower. When I realized the other aircraft may not have me in sight I made 2 more calls trying to get them to LOOK. As they closed on me I made an aggressive climb above traffic pattern altitude. They passed directly under me - from my 7 o'clock to my 2 o'clock; about 100 ft. vertical.This was a flight school aircraft. This flight school caters to foreign students and apparently they really do not understand English. They seem to know the calls they need to make for the pattern but do not seem to comprehend what is going on around them. Looking at their flight aware tracking - they never reduced power to fly the pattern. I went into the flight school to speak with the chief CFI but no one was available. As I spoke with the front desk personnel; some of the foreign students overheard and started talking in their foreign language. I have heard them use non English on CTAF. I really think the school needs to strongly prohibit the use of any non English anytime they are on the property or in an airplane. Their radio transmissions are often very difficult to understand. They also need to teach about reducing power while in the pattern. When an aircraft has a slower and constant speed; it is easier to spot other traffic. My aircraft is a legacy aircraft without [an] engine driven electrical system and is exempt from ADS-B requirements. I wonder if they were looking at Fore Flight or some other display to see traffic instead of looking out the window.