Hi everyone,
I had this issue for a while after trying all the different steps discussed in this discussion.
Here’s what I tried that WORKED for me :
1) I changed my game language preference from my origin client clicking My Game Library > Sims 4 > Settings > Game Proprieties > Advanced launch options > Game Language > English US
2) I changed my EA profile language preference to english. You can access your account through the origin client clicking “my username” > EA Account and Billing. You'll be redirected to the website. Sign in. Click About Me > Regional Settings Edit > Language > English.
3) I changed my origin client language preference to english. In the Origin Client, you need to click “my username” > Applications settings > Language > English
4) I accessed my plist documents thank to Finder > Go in the top bar > Hold alt/option so Library can appear > Library > Application support > Origin > Installer data. In this installer data folder, you can find two plist documents.
5) The 1015808.plist was missing on my computer so I duplicated 1011164.plist and just renamed the document to 1015808.plist. Make sure this is how it is written in both of the documents.
<?xml version="1.0" encoding="UTF-8"?>
<plist version="1.0">
<dict>
<key>DisplayName</key>
<string>The Sims™ 4</string>
<key>Locale</key>
<string>en_US</string>
</dict>
</plist>
6) I changed the language in both of the plist documents to en_US. Change all the plist documents if you have more than two.
7) I updated and repaired the game from the Origin Client.
8) If step 7) hasn’t work for you, just like it didn’t for me, uninstall the game, and reinstall it installing the legacy version (before this process, make sure you saved your game data from your folders).
9) At this point, the game worked for me. I put all the different language preferences back to french. It still works. Make sure in all of your plist documents than it is written this way for french.
<?xml version="1.0" encoding="UTF-8"?>
<plist version="1.0">
<dict>
<key>DisplayName</key>
<string>Les Sims™ 4</string>
<key>Locale</key>
<string>fr_FR</string>
</dict>
</plist>
As you notice, "The Sims" is in french. This means if you change back to any of your language, you need to make sure, The Sims is translated in your language as well. French canadian in your preferences need to be changed for francais de france.
I hope it will help all the users facing this issue and help the team providing a update that will fix the issue.
@EA_Mai @MaxisJoe