zh_tw-Lang-Pack-1.12v18 is a release file of the Minecraft resource pack Mods - Traditional Chinese Localization Resource Package, made for Minecraft 1.12.2. It was published on May 21, 2021 and is 8 MB in size. For the full description, screenshots and every other version, visit the Mods - Traditional Chinese Localization Resource Package resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.