Wouldn’t mind if it was the japan version, as I can speak some of it Emphasize on some and it’s kinda hard to hear what would be saying as they would talk so fast x.x  
But overall, I can adapt and learn c:

Ridicule Twilight for being named “Sumerechnaya Iskorka”.

Get a dictionary.

@Bimberfresh  
Listen to Polish Find a Pet and you’ll change your mind

Sorry. Stray letter F

i agree with ze. F Learn the language

Polish version is quite cool… Unless they start singing. Then run.

Become a powerful wizard with a pointy hat and cast a spell to learn their language..

EXPLOIT THE HELL OUT OF EVERYTHING.
 
Wait. This isn’t Minecraft.

@Obsessive Rarity Fan  
it also helps knowing lots of base Latin and Greek, which allows a lot of context to be made

When you are dropped into a situation where nobody speaks your language and there is no way out, one can pick up the native tongue quick enough. Especially if you want to be there, as I assume the brony in question does, he would make an extra effort to learn. I am also sure that somepony would be willing to tutor him at of the kindness of her heart.

if it’s Russian I’m good.

Ponder destroying the damn thing. That shit be dangerous, yo.

@Wafflecannon  
It was more of a way of saying “The language is stupidly hard” rather than impossible.
 
Generally languages from the same groups (Like Polish and Russian or English and German) share many similarities and learning them would go pretty smooth.
 
It would not be the case for a Brazilian trying to learn Polish however as he would be hit with weird sentence building weird rules and… well weird everything.
 
@N8orDIE  
No foreign languages were shown in the show as of yet.  
Foreign accents yes.  
Languages no.

Send me to Japanese :3

I’d wonder how the fuck I knew Russian.

They have foreign languages in Equestria, so somepony must know a translation spell or something, right?

Stay and try to learn the language.
 
I don’t think that there’s such thing as a language I could never understand, even if I tried. Unless it contains sounds my human vocal chords are not capable of reproducing.  
As long as it is a language of earth, there will always be loanwords (except Icelandic, they don’t use loanwords), things that sound similar and observable patterns.  
All I need is patience and time.

Act like an animal of nature.

Have Twilight learn English, if it’s really impossible for me to learn whatever they speak. She’s a frickin’ genius, it won’t take too long, and I’m an excellent non-verbal communicator as it is.

If it’s a russian device, the language is probably russian, they calibrate it for their own use. Since I figured out the root of the problem, I’ll probably doesn’t have much problem rectifying the machine and I could ask russian speaking pony with a bit of sign language and drawing for help cause they will understand the russian schematic better than me.

Try to learn the language day by day, even if it is stupid-hard. It takes a minimum of seven years to master pretty much anything in the world if you try hard enough, you’ll eventually acclimatise.
 
Heck, my friend’s brother worked alongside some polish folks, learned small-talk in a matter of months.

Solution: Before leaving, make sure the language settings on the machine are correct. Then enter.

@hectorluis13
 
Same here.

I would use the portal until i end up teleported to an equestria where i can understand what everypony is saying