Use global locale for starter projects

lib/locales.rb

@@ -18,7 +18,7 @@ def load_locales
         pt-PT ro-RO ru-RU sh-ZW si-LK sk-SK sl-SI so-SO sq-AL sr-SP sv-SE sw-KE ta-IN te-IN th-TH tr-TR tt-RU uk-UA ur-PK vi-VN vls-BE xh-ZA zh-CN zh-TW
       ]
       I18n.default_locale = :en
-      I18n.available_locales = two_letter_locales + four_letter_locales
+      I18n.available_locales = two_letter_locales + four_letter_locales + [:global]
     end
   end
 end

lib/project_loader.rb

@@ -5,7 +5,7 @@ class ProjectLoader
 
   def initialize(identifier, locales)
     @identifier = identifier
-    @locales = [*locales, 'en', nil]
+    @locales = [*locales, 'global', 'en', nil]
   end
 
   def load(include_images: false)

lib/tasks/project_components/blank_html_starter/project_config.yml

@@ -1,6 +1,7 @@
 NAME: 'Blank HTML & CSS Starter'
 IDENTIFIER: 'blank-html-starter'
 TYPE: 'html'
+LOCALE: 'global'
 COMPONENTS:
   - name: 'index'
     extension: 'html'

lib/tasks/project_components/blank_python_starter/project_config.yml

@@ -1,6 +1,7 @@
 NAME: 'Blank Python Starter'
 IDENTIFIER: 'blank-python-starter'
 TYPE: 'python'
+LOCALE: 'global'
 COMPONENTS:
   - name: 'main'
     extension: 'py'

spec/lib/project_loader_spec.rb

@@ -41,6 +41,14 @@
     end
   end
 
+  context 'when global project with identifier exists' do
+    let!(:global_project) { create(:project, identifier:, locale: 'global') }
+
+    it 'defaults to global' do
+      expect(loaded_project).to eq(global_project)
+    end
+  end
+
   context 'when no preferred locale or English versions but user version exists' do
     let!(:user_project) { create(:project, identifier:, locale: nil) }