Howdy, Stranger!
While we don’t have complete translations available for Vanilla 2 yet (there are many non-native-English speaking community members working on this), you can most certainly make little text changes on your forum very easily. Generally speaking, you can take just about any word or phrase on the forum, and create a “translation” for it by adding a “locale.php” file to your conf folder, and placing the translations inside. If you want to change the “Howdy, Stranger” text, for example, you would place the following information in your conf/locale.php file:
<?php if (!defined('APPLICATION')) exit();
$Definition['Howdy, Stranger!'] = 'Welcome to our Community!';
$Definition["GuestModule.Message"] = "If you want to take part in the discussions, sign in or apply for membership below!";
Happy translating!