Filters the translations loaded for external TinyMCE 3.x plugins.
The filter takes an associative array (‘plugin_name’ => ‘path’) where ‘path’ is the include path to the file.
The language file should follow the same format as wp_mce_translation(), and should define a variable ($strings) that holds all translated strings.
$translationsarray
$editor_idstring
'content'.$mce_external_languages = apply_filters( 'mce_external_languages', array(), $editor_id );
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https://developer.wordpress.org/reference/hooks/mce_external_languages