Life is Feudal: MMO supports lot of different languages. You can change the language from the launcher application.
Click on the e-mail that is displayed on the top-right corner of the launcher application.
The small window will pop-up where you can set the status for your friends. Go to the Launcher Settings.
After clicking you will see the option to select language.
Right after you click Done - language will be accepted immediately. You can now enter the game to see the changes.