Set Twitter language for WordPress oEmbeds

gistfile1.php

global $wp_version;

if ( version_compare( $wp_version, '3.5', 'ge' ) ) {
	if ( !function_exists( 'ucc_oembed_twitter_lang' ) ) {
		function ucc_oembed_twitter_lang( $provider, $url, $args ) {
			if ( stripos( $url, 'twitter.com' ) ) {
				if ( defined( 'WPLANG' ) )
					$lang = strtolower( WPLANG );
				if ( empty( $lang ) )
					$lang = 'en';

				$args['lang'] = $lang;
				$provider = add_query_arg( 'lang', urlencode( $lang ), $provider );
			}
			return $provider;
		}
	}
	add_filter( 'oembed_fetch_url', 'ucc_oembed_twitter_lang', 10, 3 );
} else {
	// The above filter was introduced in v3.5, for 3.4 replace the existing OEmbed line with a new one
	add_filter('oembed_providers','twitter_oembed');
	function twitter_oembed($a) {
		if ( defined( 'WPLANG' ) )
			$lang = strtolower( WPLANG );
		if ( empty( $lang ) )
			$lang = 'en';
		$a['#https?://(www\.)?twitter.com/.+?/status(es)?/.*#i'] = array( 'http://api.twitter.com/1/statuses/oembed.{format}?lang='.$lang, true  );
	    return $a;
	}
}

/*
	Copyright 2012 Jennifer M. Dodd (email: jmdodd@gmail.com)
	Heavily Modified by Tom J Nowell ( contact@tomjn.com )
	Released under the GPLv2 (or later).
*/