language

I am using the apex sdk with language='fr' option on the package, email to the signers comes in french but upon clicking the link where it takes you to the login page, it always shows in English. 

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Hi,

I'm finding the language settings to be quite confusing and don't see a thorough guide explaining it. Here are some questions I have. If there is a guide, please point me in the right direction, else I'll need some help to understand the following.

1. The package level object has a language parameter. Which areas does this affect?

2. The signer level object has a language parameter. which areas does this affect?

3. The signer level object also has a "withLocalLanguage" attribute, which areas does this affect?