Big Sur Language Support Articles
Here are links to key Big Sur support articles useful for those who need to use different languages on their Mac:
Choose Different Languages for Individual Apps
Create Text Replacements for Symbols and Special Characters
Fixing Incorrect Forms in Non-Latin Fonts
View Different Language Keyboards Sold by Apple
Type Arabic/Hebrew in iWork Apps
MacOS Feature Availability by Region and Language
Languages Supported by Voice Over
Country Availability of Apple Media Services