Language Override 

Use this loader to create "locallangXMLOverride" configurations for language files. Recreate the same folder structure of the extension whose language files you want to override within Resources/Private/Language/Overrides. The first level is the extension name (UpperCamelCase). For XLIFF files language prefixes like de.locallang_mod.xlf are supported to register overrides for translations.

For example to override EXT:foo_bar/mod1/locallang_mod.xlf just create the file Resources/Private/Language/Overrides/FooBar/mod1/locallang_mod.xlf and fill it with language entries. To override EXT:foo_bar/mod1/de.locallang_mod.xlf create Resources/Private/Language/Overrides/FooBar/mod1/de.locallang_mod.xlf.

Even if an extension follows the usual Resources/Private/Language structure, you still have to recreate that structure within Resources/Private/Language/Overrides, e.g. Resources/Private/Language/Overrides/BazQux/Resources/Private/Language/locallang.xlf.

Internally the following kind of configuration will be generated:

$TYPO3_CONF_VARS['SYS']['locallangXMLOverride']['default']['EXT:baz_qux/Resources/Private/Language/locallang.xlf'][] = 'EXT:my_ext/Resources/Private/Language/Overrides/BazQux/Resources/Private/Language/locallang.xlf';
$TYPO3_CONF_VARS['SYS']['locallangXMLOverride']['de']['EXT:baz_qux/Resources/Private/Language/locallang.xlf'][] = 'EXT:my_ext/Resources/Private/Language/Overrides/BazQux/Resources/Private/Language/de.locallang.xlf';
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