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go to your documents, then select paradox interactive, then select settings Europa Universalis, then select the notepad file "Settings"

change it back to language="l_English"

good day sir :)
 
Try verifying the integrity of game cache, if that did not work. Try a full clean install.

  • Go to your Steam games library.
  • Right click on "Europa Universalis IV" and select "properties".
  • Click on the tab "Local Files".
  • Now click on "Verify integrity of game cache".
  • Wait until this process is finished, if any files are missing/corrupted it will notify you at the end of the process and automatically start with redownloading these files.

Full clean install:
  • Important: Go to '..\Documents\Paradox Interactive\Europa Universalis IV\save games\' and copy all the save games you want to keep outside the folder.
  • Go to your Steam Games library, right click on "Europa Universalis IV" and select "Delete content".
  • Go to the steam installation folder at '..\Steam\SteamApps\common\', and check if the Europa Universalis IV folder is removed. If not, delete the entire folder.
  • Go to '..\My Documents\Paradox Interactive\' and remove the entire Europa Universalis IV folder.
  • Install the game, make sure you install the game outside the 'C:\Program Files\' or 'C:\Program Files (x86)\' folders, as it can cause issues with permissions.