Quite a bit of the text is imbedded in the code so hard to get at, but some is available. If you look at the game folder, the is folder titled "Localization".  In it is another folder titled "En". This is the English version of all the visible labels and some other text. You can copy this file and replace the  English  with whatever language you wish. Only change the text to the right of the  = sign. I don't the mechanism for getting the text into the game, but there are some other file in the Localization folder that may give you hints.