Linlocalize conforms to the language codes as used by Delphi in Microsoft. The languages are designated by a two letter code, such as "en" for English or "es" for Spanish. One or more hyphenated values can be tacked on to the initial two letter code to specify regional or ethnic variations, such as "en-us" for U.S. English. The codes specifies a unique name for each culture, based on RFC 4646 (Windows Vista and later). The name is a combination of an ISO 639 two-letter language code and an ISO 3166 two-letter country or region code.
LinLocalize uses codes in capitals to speed up search processes. The codes are saved in the ini-file, where you can add or delete codes as desired. See also Using language and country codes. The ini-file is saved in the project directory.