Configuration of membergroup, membertype name and alias, homepage doctypealias, and dictionary items

Membergroup name, membertype name and alias, homepage doctype alias can
now be configured from web.config. In not defined it defaults to the old
values
Added dictionary items to all files where needed. Especially the
controllers are hard to change as they are compiled, but also views as
they are not accessible from backoffice. The dictionary helper function
automatically adds dictionary items, if they don't exist, so no need to
update beforehand.