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) ?

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.