A column stores information about each document in the document library. Because this document library allows multiple content ...

A column stores information about each document in the document library. Because this document library allows multiple content types, some column settings, such as whether information is required or optional for a column, are now specified by the content type of the document. The following columns are currently available in this document library:
English
English (United States)
Deutsch (Deutschland)
German (Germany)
Français (France)
French (France)
日本語
Japanese
한국어
Korean
Русский
Russian