Use consistent language for invite codes

lib/tasks/invites.rake

@@ -1,5 +1,5 @@
 namespace :invites do
-  desc "Create an invitation code"
+  desc "Create an invite code"
   task create: :environment do
     puts InviteCode.generate!
   end

test/controllers/registrations_controller_test.rb

@@ -15,7 +15,7 @@ class RegistrationsControllerTest < ActionDispatch::IntegrationTest
     assert_redirected_to root_url
   end
 
-  test "create when hosted requires an invitation code" do
+  test "create when hosted requires an invite code" do
     ENV["HOSTED"] = "true"
 
     assert_no_difference "User.count" do

test/models/invite_code_test.rb

@@ -1,7 +1,7 @@
 require "test_helper"
 
 class InviteCodeTest < ActiveSupport::TestCase
-  test "claim! destroys the invitation token" do
+  test "claim! destroys the invite token" do
     code = InviteCode.generate!
 
     assert_difference "InviteCode.count", -1 do
@@ -17,7 +17,7 @@ class InviteCodeTest < ActiveSupport::TestCase
     assert_not InviteCode.claim!("invalid")
   end
 
-  test "generate! creates a new invitation and returns its token" do
+  test "generate! creates a new invite and returns its token" do
     assert_difference "InviteCode.count", +1 do
       assert_equal InviteCode.generate!, InviteCode.last.token
     end