$url = $this->repo->getDescriptionRenderUrl( $this->getName(), $wgContLang->getCode() );
$key = $this->repo->getLocalCacheKey( 'RemoteFileDescription', 'url', md5( $url ) );
$url = $this->repo->getDescriptionRenderUrl( $this->getName(), $wgContLang->getCode() );
$key = $this->repo->getLocalCacheKey( 'RemoteFileDescription', 'url', md5( $url ) );