SpecialMyLanguage.php

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<?php
use MediaWiki\MediaWikiServices;

class SpecialMyLanguage extends RedirectSpecialArticle {
    public function __construct() {
        parent::__construct( 'MyLanguage' );
    }

    public function getRedirect( $subpage ) {
        $title = $this->findTitle( $subpage );
        // Go to the main page if given invalid title.
        if ( !$title ) {
            $title = Title::newMainPage();
        }
        return $title;
    }

    public function findTitle( $subpage ) {
        // base = title without language code suffix
        // provided = the title as it was given
        $base = $provided = null;
        if ( $subpage !== null ) {
            $provided = Title::newFromText( $subpage );
            $base = $provided;

            if ( $provided && strpos( $subpage, '/' ) !== false ) {
                $pos = strrpos( $subpage, '/' );
                $basepage = substr( $subpage, 0, $pos );
                $code = substr( $subpage, $pos + 1 );
                if ( strlen( $code ) && Language::isKnownLanguageTag( $code ) ) {
                    $base = Title::newFromText( $basepage );
                }
            }
        }

        if ( !$base ) {
            // No subpage provided or base page does not exist
            return null;
        }

        if ( $base->isRedirect() ) {
            $page = new WikiPage( $base );
            $base = $page->getRedirectTarget();
        }

        $uiLang = $this->getLanguage();
        $contLang = MediaWikiServices::getInstance()->getContentLanguage();

        if ( $uiLang->equals( $contLang ) ) {
            // Short circuit when the current UI language is the
            // wiki's default language to avoid unnecessary page lookups.
            return $base;
        }

        // Check for a subpage in current UI language
        $proposed = $base->getSubpage( $uiLang->getCode() );
        if ( $proposed && $proposed->exists() ) {
            return $proposed;
        }

        if ( $provided !== $base && $provided->exists() ) {
            // Explicit language code given and the page exists
            return $provided;
        }

        // Check for fallback languages specified by the UI language
        $possibilities = $uiLang->getFallbackLanguages();
        foreach ( $possibilities as $lang ) {
            if ( $lang !== $contLang->getCode() ) {
                $proposed = $base->getSubpage( $lang );
                if ( $proposed && $proposed->exists() ) {
                    return $proposed;
                }
            }
        }

        // When all else has failed, return the base page
        return $base;
    }

    public function personallyIdentifiableTarget() {
        return true;
    }
}