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Introduction
The main purpose of the TCA language configuration is to simplify the TCA
language configuration. It therefore supersedes
the special=languages option of TCA columns with type=select.
Formerly foreign_ relations to the table sys_ had also
been used. This became deprecated with the introduction of site
configurations with TYPO3 v9.
This field type decouples the actually available site
languages from the sys_ table.
This TCA type automatically displays all available languages for the
current context (the corresponding site configuration) and also automatically
adds the special -1 language (meaning all languages) for all record
types, except pages.
In records on root level (pid=0) or on a page, outside of a site context,
all languages from all site configurations are displayed in the new field.