arabic

I'm new to Drupal, I am about to create a multi-language site, I had to go with D5.7 since D6 is not yet compatible with many modules that I want to use.
I've been researching drupal sites for a step-by-step guide , I found some information in drupal handbooks but I still have many questions:

• the locale module allows to translate core drupal modules and strings, does the i18n module allow to translate any newly installed modules ? or is it just about translating content (nodes) ?

Dear Drupal users,

I am looking for short, medium and long-term programming / development assistance for an international initiative soon-to-be-launched aimed at prosecuting the United States, its leaders and allies, on charges of the crime of genocide in Iraq.

The new initiative is currently being built offline. It already needs significant volunteer resources, particularly in establishing capacity to provide content in Arabic and Spanish as well as English. There are also significant security considerations that need expert input.

Greetings,

Is there a translation available for the welcome emails that Drupal sends out? I am using the i18n module and it allows me to change those email messages. I have a translator who will be able to translate them, but if the work has been done already, why have him do it again?

Please advise. Thank you.