@Hikari38 Please describe exactly what your household member did to change the language back to English, or have him describe it. The issue here is that the text strings are missing or corrupt, and repairing may not have downloaded the correct English-language strings considering the EA App switched you over to Czech.
What he did was find the Windows Registry Editor (typed "regedit" in the system search bar) and then found the tab HKEY_LOCAL_MACHINE\SOFTWARE\Maxis\The Sims 4. Then he found a file under the name of "Locale". Right clicked it, chose the option to "Modify...". A window popped up and there he found the "value data" section, where he typed en_US and the game language changed back to English, without having to reinstall the entire game.
I bought the base game as a physical copy and I believe I used the "traditional" way till everything moved to digital copies only. Then I would purchase the following DLC via Origin. Growing Together is the first EP I bought via EA App, since I was forced to migrate.
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