As you'll see in doing this, packages contain multiple files and folders, but in this case your interest should turn to the Resources folder, which contains subfolders ending with “lproj”. Localization files will become visible if you right-click on an application icon in the Applications folder and select “Show Package Contents”.
Other third party apps will let you set the desired language. So, if you are using a Danish macOS, Acrobat Reader will operate in Danish thanks to the localization files included in the app package.
Did you know that the ultra-popular PDF file reader Adobe Acrobat Reader includes multiple language files, including everything from Spanish and French to Hungarian and Ukrainian? When Acrobat Reader is installed, it will default its interface language to the one used by the operating system. Localization files are stored inside application packages that are installed onto your Mac. Clean 500MB of Junk for Free Where Are Localization Files Stored?