PROBLEM PHP - button text translate to 3 languages

[bonyway]

Hi.
I would like to translate a text for the buttons like “Previous” and “Next” to 3 languages for the news.

I tried to add the script in component (for example for Next):
<?php
if ($lang = 'en') {
echo 'Next';
}else if ($lang = 'de') {
echo 'Naechste';
}else if ($lang = 'fr') {
echo 'Suivant ';
}
?>

In the moment the canonical in german:
<link rel="canonical" href="http://[my domain].de/?lang=de" />
but in a page gets converted in English: “Next”

I’m very bad in PHP
May be someone can me help
Thx

P.S.: the Plugin I18N, I18N Base and I18N_Search working perfect…