Add custom CSS (#264)

config/locales/backend/backend.en.yml

@@ -121,6 +121,7 @@ en:
         root_board_id: 'Root page'
         show_roadmap_in_header: 'Show roadmap link in header'
         collapse_boards_in_header: 'Collapse boards in header'
+        custom_css: 'Custom CSS'
       user:
         email: 'Email'
         full_name: 'Full name'

config/locales/en.yml

@@ -144,6 +144,7 @@ en:
       roadmap: 'Roadmap'
       users: 'Users'
       authentication: 'Authentication'
+      appearance: 'Appearance'
     info_box:
       up_to_date: 'All changes saved'
       error: 'An error occurred: %{message}'
@@ -178,6 +179,9 @@ en:
       title2: 'Not in roadmap'
       empty: 'The roadmap is empty.'
       help: 'You can add statuses to the roadmap by dragging them from the section below. If you instead want to create a new status or change their order, go to Site settings > Statuses.'
+    appearance:
+      title: 'Appearance'
+      learn_more: 'Learn how to customize appearance'
     users:
       title: 'Users'
       block: 'Block'
@@ -195,6 +199,7 @@ en:
       status_deleted: 'Deleted'
     authentication:
       title: 'Authentication'
+      learn_more: 'Learn how to configure custom OAuth providers'
       oauth_subtitle: 'OAuth providers'
       default_oauth: 'Default OAuth provider'
       copy_url: 'Copy URL'