Well, you can easily create a selection question with all available languages as options (consider using the card layout for the selection), and a PHP filter on the next page to switch to the respective language:
$code = value('SE01');
if ($code == 1) {
setLanguage('eng');
} elseif ($code == 2) {
setLanguage('fre');
} elseif ($code == 3) {
setLanguage('eng');
} ...
Now that you have created a custom language selection, tell the questionnaire always to start in English (or whatever).
Finally mark your links with a reference, so that SoSci SUrvey knows in which language the respondents are, and use another PHP filter on the first page to show the language selection with the respective language options, or skip to the next page.
$ref = reference();
if ($ref = 'ger') {
question('SE01', [3,4]);
} elseif ($ref = 'fre') {
question('SE01', [5,6]);
} elseif ($ref = 'ita') {
setLanguage('ita');
} ...