How could "aggressor" pilots fly foreign aircraft without speaking the language? Context

I watched a couple documentaries recently and found one where they were mentioning the training of American forces against Mi-24 that were captured and brought back to the US to test fly them. Shortly afterward General Chuck Yeager tweeted a quote from General Boyd saying 


  Because of Yeager, we now know more about the MiG-15 than the Russians do.


after he flew one in 1953 that was captured during the Korean War.

Research

This piqued my curiosity because as far as I know Russian aircraft have: 


Different units for instruments (metric system with km/h, meters etc.)
Different approach to instruments (as explained in this question)
Obviously, everything written in Cyrillic with alerts in Russian




I checked the page on Constant Peg program in the US to train aggressors and them flying foreign aircraft (like MiG 17, 21 and 23) as well as other aircraft. While I understand that this specific program is still classified, there are other occurrences of aircraft flown by "non-Russian speakers" or at least non-Natives.

While it is totally possible that General Chuck Yeager is fluent in Russian, I have some doubts about flying an aircraft where everything is written in another language from the fuel dump to the auto-pilot settings, and be able to operate it easily (on top of that without a manual).

Question

Now this led me to this question, how do you fly an aircraft without speaking the language and how do you read the instruments and their functions ?

I very much doubt that they just put sticky notes over all instrument panels with the label of instruments (but I could be wrong, who knows).
A couple of things come to mind that enable this: 


you don't become a fighter pilot if you are not intelligent and highly motivated
you are not learning a new skill, just doing what you are already trained to do in an environment that just looks different (this would somewhat exclude Russian helicopters)
the list of things to learn is really not that long, I'm taking the liberty to throw in a guess of 100 items
you have a huge organization backing you up (translations as mentioned in comments, intelligence data etc.)


So: You are a person that is able to fly fighter jets, most probably you are damn good at it if you are given the opportunity to fly a fighter caught from the enemy.

You learn new stuff easily, and you are thrilled to do this, which of course helps in the learning process. Your organization provides you with pretty much every bit of information about the task you are about to undertake, translated manuals etc.

Regarding the cockpit language barrier, it's not that hard to learn the labels on switches and gauges. For example the picture in the question: I took a not-so-wild guess that it's an altimeter, checked with translator and yes: высота is altitude in English (pronounced something like vysota but that really doesn't matter). From now on, when I see text that says высота, I know it means altitude. On Russian planes the pilot just has to remember the altitude is in meters, but since the label looks "weird" I don't think there's much chance of a mix-up.

Anyways, when operating a fighter jet, you learn the location and operation of the critical switches and systems by heart, you do not browse around the cockpit searching for switches when you need to do something.

Once you've become familiar with the user interface, the basic flying will be pretty much the same as in any western fighter.

P.S. There's one thing that really helps: Cyrillic numbers are not used anymore :)

P.P.S. this short film on Air&amp;Space Magazine website tells very nicely and in a compact package of the findings made by Chuck Yager (Major at the time) and General Albert Boyd during test flights of the MiG-15. Thorough testing gave USAF critical information of the capabilities and weaknesses of the enemy fighter, giving them strategic and operational advantage.