Hi,
Yes, it is possible. But you should be familiar with how to use Joomla Translation.
You should use "Language Labels" for custom TAB's title (and content), and translate them through language INI file.
This is a 100% custom modification and unfortunately we don't provide free support or step-by-step instructions for custom coding modifications.
You may purchase premium support:
www.flexiblewebdesign.com/premium-support
and let us take care this modification for you directly on your website though.
Regards.
Support