Plasma donation compatibility path. The diagram uses type O (letter O) for most languages except for Czech-cs Danish-da German-de Estonian-et Finnish-fi Dutch-nl Norwegian-nn (but not no), and Swedish-sv, which each use type 0 (number zero). There are at least five languages that use other symbols, Bengali-bn (হে), Gujarati-gu (ઓ), Hindi-hi (ओ), Kannada-kn (ಒ), and Punjabi-pa (ਓ). Others can be easily added, and any changes made, by editing the file and uploading a new version. The languages may not show up in a drop down selection but are available by using |lang=xx.
https://en.wikipedia.org/wiki/File:Plasma-donation.svg
Giancaldo at English Wikipedia