Copy localization.txt to your desktop. Rename it localization_backup.txt . Never delete it.
In technical terms, this file is a localized string database. Without it, the game would display variable names like LUA_ROOT_MP_LOBBY instead of human-readable text like "Find a Match." Unlike Modern Warfare (2019) or Cold War , which encrypt their localization data inside massive .pak or .sabs archives, Black Ops 3 (on PC) leaves the English localization relatively exposed. This was a deliberate choice by Treyarch to support the game’s extensive mod tools . By making the localization file editable, they allowed custom map makers to rename weapons, change objective text, and create narrative-driven mods without needing proprietary software. Part 2: Locating the File on Your System If you own Black Ops 3 on Steam, finding this file is straightforward. However, note that the exact location depends on whether you are running the base game or the mod tools development version. Call Of Duty Black Ops 3 English Localization.txt
If you have verified your game files via Steam, the file will automatically be restored to its default state. Always back up the original before editing. Part 3: Anatomy of the File – What’s Inside? Opening Call Of Duty Black Ops 3 English Localization.txt with Notepad++ or Visual Studio Code reveals a massive (over 2MB) file organized into sections. While it is a .txt file, it follows a strict syntax: REFERENCE = "String Value" Copy localization
Even on PC, the Steam version of Black Ops 3 downloads language packs (French, German, Spanish, etc.) as separate DLC. The English Localization.txt is only active when your Steam client language is set to English. If you switch languages, the game ignores this file and uses a sibling file like localization_french.txt . The biggest frustration with editing this file is Steam Updates . Every time Treyarch pushes a minor patch (for security or anti-cheat), they may include an updated localization.txt . If you have modified yours, Steam will automatically overwrite it, erasing your work. In technical terms, this file is a localized string database
Do not use Windows Notepad (it breaks UTF-8 formatting). Download Notepad++ or Sublime Text .
Treyarch uses VAC (Valve Anti-Cheat) . Editing localization.txt for cosmetic UI changes is generally safe for private matches, but do not attempt to inject strings that modify gameplay variables (e.g., changing "50 points" to "9999 points" does not give you points; it only changes text). However, to be safe, always run modified .txt files in Offline Mode or via the official Mod Tools launcher. Part 7: The Modding Community's Relationship with Localization.txt In the Black Ops 3 Steam Workshop community, localization.txt is a goldmine. Custom zombie maps often come with custom narrative scripts. To provide an English voiceover for a map featuring German or Japanese characters, modders inject their translated dialogue strings into this file.
Whether you are fixing a broken mod, renaming a weapon for a YouTube video, or simply curious about how games handle language, localization.txt is your gateway. Just remember the golden rule of PC gaming: Always make a backup. Have you successfully edited your Black Ops 3 localization file? Share your custom string creations in the comments below, or head to the Steam Workshop to see mods that leverage this file for full immersion.