The SimCity language is code specific, meaning that only the native languages of the area you bought it in will be available.
The russian, hungarian and polish version is a special discounted edition of SimCity, and is being sold online with an invalid "language pack" which will cause a continuous update loop and never install properly. It will install/run fine without the language pack, but only in the stated languages.
The only way to change the language to english is to contact a Game Advisor and get a new 'english' game code. It has worked for numerous players in other countries who have purchased SimCity at it's regular price. I believe the East EU version is the exception to the rule.
Note that the Origin reinstall will only change the language to english if the game code has that capability.
