Multilang website using wordpress help

first i am sorry for my not so great english.
i want to make a multilang wordpress website, now i can find how to make custom title, description and some more for every languege.
i allready made it to be different title for every tipe of page in my website for exemple:

<title>
<?php
if (is_home()) { echo (' testitle ');}
elseif (is_404()) { echo 'EROR 404 | MYSITE'; }
else if ( is_search() ) { echo (' Search result for '); the_search_query(); echo (' | MYSITE');}
else if ( is_single() ) { the_title(); echo (' | MySereT');}
else if ( is_category() ) { single_cat_title(); echo (' | MYSITE');}
else if ( is_archive() ) { echo (' Archive '); wp_title(''); echo ' | MYSITE'; }
else { bloginfo('name'); echo (' - '); wp_title(''); }
?>
</title>

but now i want to make for every lang different title and description because i cant to have the same title for different language.
so please help me. i am using qtranslate plugin on my wp website and realy need that.
is it even possible to do it using php code in header.php?

hugh thanks ppl.
hope you can help me
nechemya.