I have tried so
index.php
PHP Code:
<?php
$lang = $_GET["lang"];
if($lang == "")
{
$lang = "de";
}
include("language/lang_".$lang.".php");
...
?>
<?php echo '<?xml version="1.1" encoding="iso-8859-1"?>'; ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title><?php echo $Titel ?></title>
...
lang_de.php
PHP Code:
<?php
$Titel = "Video2MP3.eu - Youtube und Dailymotion Videos Online umwandeln";
$Convert = "Video wird umgewandelt. . .";
$Success = "Abgeschlossen";
$Download_File = "Datei runterladen";
$Create_Ringtone = "Klingelton erstellen";
$Error_gen_file = "Fehler beim erzeugen der Convertierten Datei";
$Wait_Convert = "...Bitte warten, das Video wird umgewandelt:";
$Video_Download = "Video runterladen. . .";
$Error_Download = "Fehler beim Download, bitte versuche es erneut!";
$Wrong_url = "Falsche video URL oder dateityp! Bitte versuche es nochmal.";
$Vaild_url = "Gib eine gültige YouTube.com oder Dailymotion.com Video URL ein";
$Choose_file_type = "In welches Format soll das Video umgewandelt werden?";
$Convert_Video_Button = "Video Umwandeln";
$Format = "Format";
$Codec = "Codec";
$Bitrate = "Bitrate";
$Type = "Typ";
$HD = "* = 2000 kbit/s nur wenn das Video in HD vorliegt.";
$iOS_Support = "² = iPhone, iPad, iPod geeignet.";
$Footer_text = "evtl. Darstellungsprobleme mit dem Internet Explorer.";
$Twitter_Tweet = "Twittern";
$Twitter_lang = "de";
?>
lang_en.php
PHP Code:
<?php
$Titel = "Video2MP3.eu - Convert Youtube und Dailymotion Videos Online";
$Convert = "Converting video. . .";
$Success = "Success";
$Download_File = "Download your converted file";
$Create_Ringtone = "Create Ringtone";
$Error_gen_file = "Error generating converted file!";
$Wait_Convert = "...Please wait while I try to convert:";
$Video_Download = "Downloading video. . .";
$Error_Download = "Error downloading video, please, try again!";
$Wrong_url = "Invalid video URL or file type! Please, try again.";
$Vaild_url = "Enter valid Youtube.com or Dailymotion.com video URL";
$Choose_file_type = "Choose file type to convert video to:";
$Convert_Video_Button = "Convert Video";
$Format = "Format";
$Codec = "Codec";
$Bitrate = "Bitrate";
$Type = "Type";
$HD = "* = 2000 kbit/s only when the video is in HD.";
$iOS_Support = "² = iPhone, iPad, iPod support.";
$Footer_text = "possibly display issues with Internet Explorer.";
$Twitter_Tweet = "Tweet";
$Twitter_lang = "en";
?>
the translation also works great, but when I choose English and then convert a video , it automatically jumps to the default language (German)

.
you can test it here:
http://video2mp3.eu/test/?lang=en