Updated new-groups / group-plans static page #8674 (#8729)

* dummy

* Renamed internationalized strings to more meaningful names

* moved the new group creation state out to its own URL, so it can also be linked to by the static/plans page

* Added redirect-through-login functionality from the static/plans page new-group button
This includes a static non-modal login page (similar to how other sites have both a login page and login modal)
The login body has been abstracted out from its modal-specific view into mixins to accomplish this

* deleted bak files added by mistake

* deleted scripts added by mistake

* changed static/plans Create Group button text

* Added form link (https://github.com/HabitRPG/habitica/issues/8674#issuecomment-303518039)
Removed changes to non-EN locale files (https://github.com/HabitRPG/habitica/pull/8729#issuecomment-303555211)

* reverted key name changes as per https://github.com/HabitRPG/habitica/pull/8729#issuecomment-304515534

* changed $rootScope to $scope
https://github.com/HabitRPG/habitica/pull/8729#discussion_r120695874

website/server/controllers/top-level/pages.js

@@ -28,7 +28,7 @@ api.getFrontPage = {
   },
 };
 
-let staticPages = ['front', 'privacy', 'terms', 'features',
+let staticPages = ['front', 'privacy', 'terms', 'features', 'login',
                    'videos', 'contact', 'plans', 'new-stuff', 'community-guidelines',
                    'old-news', 'press-kit', 'faq', 'overview', 'apps',
                    'clear-browser-data', 'merch', 'maintenance-info'];