Rename Addressbook to Contacts

[alecpl]

I think most apps use "Contacts" rather than Addressbook these days. Also, since multiple addressbooks are supported the singular term is a bit odd. Perhaps we should consider changing the (user-visible) name of the component from Addressbook to Contacts?

[ricardo777]

+1 from me, same as the big other mail hosting like gmail.

[alecpl]

Additionally the list of contact sources now called "Groups" should probably be changed to "Address books". The top level items there aren't groups, but books.

[thomascube]

I think the term "Groups" more adequately describes what's listed in that column: books and groups. Once can consider address books as a way of "grouping" contacts but groups aren't really "address books" to me.

[skaero]

I like "Contacts" but would keep "Groups" while other systems still used "Address books" I don't think its a name we need to keep.