feat: Sites feature backend

docs/design/states.md

@@ -38,8 +38,8 @@ Glossary pass 2, changes made: activity log lines "Removed N expired invites" an
 | 400 invalid_site_url | "Use https. For example https://blog.example.com." / "Remove the path. Use only the host, like https://blog.example.com." / "Enter a full URL, like https://blog.example.com." (inline under base url) |
 | 409 site_key_taken | "A site with the key "journal" already exists. Choose another key." (inline under key, with a suggestion) |
 | 409 site_has_articles | "Choose where the articles go. This site has 38 articles." (inside the delete dialog) |
-| 403 owner_only (page) | "You don't have access to Sites" / "Only the owner can manage sites. Ask the owner of this site if you need a change." / "Back to Settings" (403 page on /settings/sites) |
-| 403 owner_only (action) | "Only the owner can manage sites" / "Ask the owner of this site." (error toast, role changed while the page was open) |
+| 403 "Only the owner can do this." (page) | "You don't have access to Sites" / "Only the owner can manage sites. Ask the owner of this site if you need a change." / "Back to Settings" (403 page on /settings/sites) |
+| 403 "Only the owner can do this." (action) | "Only the owner can manage sites" / "Ask the owner of this site." (error toast, role changed while the page was open) |
 | 403 author_rights | "Only an owner or admin can change authors" / "You can still edit your own author profile." (error toast, role changed while the page was open) |
 | 400 key_immutable | "Used in API paths, so it can't change." (not shown: the edit form has no editable key) |
 | 400 invalid_locale | "Use a language tag like en or fr-CH." (inline under locale) |