Inside TYPO3
3.8.5. Introduce a new language in TYPO3
If you wish to add a new language to TYPO3, follow these steps:
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First, a 2-char unique language key not yet used (Current Language key list: see t3lib/stddb/tbl_be.php:be_users:lang) and charset (utf-8 is default) must be agreed upon.
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Contact a core developer and ask him to add the language key to the core. The steps for doing this is defined inside t3lib/config_default.php in a comment just above the definition of the constant "TYPO3_languages".
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As soon as the language is added to the core you can start translation using the extension "llxmltranslate" running on the new core. The language pack is automatically created in "typo3conf/l10n/[new language key]/"