Remove devise entries from en.yml

I think the devise namespace on en.yml belongs to spree_auth_gem. Some apps may not use devise at all or have some custom routes as the spree_auth_gem itself.

Those entries were added back to spree_auth_gem in https://github.com/spree/spree_auth_devise/commit/d4e737d5c70d0fdfd03e320d3a87f6c2f4440d34