Some custom maps are built by international creators who hardcode foreign string assets into their maps. If your game crashes only on specific custom maps, look inside the zone folder within your workshop directory to ensure an english folder exists.
(FastFile) scripts and dialogue data for the English version. Call Of Duty Black Ops 3 English Localization.txt
If this file is missing, empty, or misspelled, the game will fail to boot. Some custom maps are built by international creators
In the world of Call of Duty: Black Ops III , the file localization.txt is a critical configuration document that acts as the "language switch" for the game's entire user interface, subtitles, and dialogue. For many players, especially those who have purchased regional versions (such as the RU/CIS version), this small text file is the key to unlocking the full English experience. What is the Localization.txt File? If this file is missing, empty, or misspelled,
Do not use Windows Notepad (it breaks UTF-8 formatting). Download Notepad++ or Sublime Text .
C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III\ Common Errors Caused by Localization Issues