SpecialMyLanguage.php

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<?php
class SpecialMyLanguage extends UnlistedSpecialPage {
    public function __construct() {
        parent::__construct( 'MyLanguage' );
    }

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

        $this->getOutput()->redirect( $title->getLocalURL() );
    }

    protected function findTitle( $par ) {
        global $wgLanguageCode;
        // base = title without language code suffix
        // provided = the title as it was given
        $base = $provided = Title::newFromText( $par );

        if ( strpos( $par, '/' ) !== false ) {
            $pos = strrpos( $par, '/' );
            $basepage = substr( $par, 0, $pos );
            $code = substr( $par, $pos + 1 );
            $codes = Language::getLanguageNames( false );
            if ( isset( $codes[$code] ) ) {
                $base = Title::newFromText( $basepage );
            }
        }

        if ( !$base ) {
            return null;
        }

        $uiCode = $this->getLanguage()->getCode();
        $proposed = Title::newFromText( $base->getPrefixedText() . "/$uiCode" );
        if ( $uiCode !== $wgLanguageCode && $proposed && $proposed->exists() ) {
            return $proposed;
        } elseif ( $provided && $provided->exists() ) {
            return $provided;
        } else {
            return $base;
        }
    }

    public static function linkfix( $dummy, $target, &$html, &$customAttribs,
        &$query, &$options, &$ret
    ) {
        if ( $target->getNamespace() == NS_SPECIAL ) {
            list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $target->getDBkey() );
            if ( $name === 'MyLanguage' ) {
                $realTarget = Title::newFromText( $subpage );
                if ( !$realTarget || !$realTarget->exists() ) {
                    $options[] = 'broken';
                    $index = array_search( 'known', $options, true );
                    if ( $index !== false ) {
                        unset( $options[$index] );
                    }

                    $index = array_search( 'noclasses', $options, true );
                    if ( $index !== false ) {
                        unset( $options[$index] );
                    }
                }
            }
        }

        return true;
    }
}