I18N and L10N (The GNU Awk User’s Guide)
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13.1 Internationalization and Localization
Internationalization means writing (or modifying) a program once, in such a way that it can use multiple languages without requiring further source code changes. Localization means providing the data necessary for an internationalized program to work in a particular language. Most typically, these terms refer to features such as the language used for printing error messages, the language used to read responses, and information related to how numerical and monetary values are printed and read.
