PageLangLogFormatter.php

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<?php
class PageLangLogFormatter extends LogFormatter {
    protected function getMessageParameters() {
        // Get the user language for displaying language names
        $userLang = $this->context->getLanguage()->getCode();
        $params = parent::getMessageParameters();

        // Get the language codes from log
        $oldLang = $params[3];
        $kOld = strrpos( $oldLang, '[' );
        if ( $kOld ) {
            $oldLang = substr( $oldLang, 0, $kOld );
        }

        $newLang = $params[4];
        $kNew = strrpos( $newLang, '[' );
        if ( $kNew ) {
            $newLang = substr( $newLang, 0, $kNew );
        }

        // Convert language codes to names in user language
        $logOld = Language::fetchLanguageName( $oldLang, $userLang )
            . ' (' . $oldLang . ')';
        $logNew = Language::fetchLanguageName( $newLang, $userLang )
            . ' (' . $newLang . ')';

        // Add the default message to languages if required
        $params[3] = !$kOld ? $logOld : $logOld . ' [' . $this->msg( 'default' ) . ']';
        $params[4] = !$kNew ? $logNew : $logNew . ' [' . $this->msg( 'default' ) . ']';
        return $params;
    }
}