You generally do not need to download a separate third-party "Language Switcher" tool for Call of Duty: Black Ops III. The game has built-in language options, but they are often hidden or dependent on the version of the game you own (Steam vs. Microsoft Store).
If the Language tab is missing (often in specific regional versions like Russian or Japanese), you can try forcing it via the game's local files.
While there is no "official" standalone tool named Black Ops 3 Language Switcher
Most users can change the language without downloading external tools by using the Steam Library: Close the game and open your Steam Library.
C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III Steam Community 2. Download Necessary Files
Step 1: Download Required FilesYou need the specific localization files for your target language. Common community-hosted packs include: English Language Files: Available via MEGA or Google Drive.