feat(web/flutter): expand error-copy map with auth + validation + 404 codes

flutter_client/assets/error-copy.json

@@ -1,6 +1,34 @@
 {
   "unknown": "Something went wrong.",
   "unauthenticated": "Your session has ended. Please sign in again.",
+  "auth_required": "You need to sign in to do that.",
+  "forbidden": "You don't have permission to do that.",
+  "not_authorized": "You don't have permission to do that.",
+  "invalid_credentials": "Wrong username or password.",
+  "wrong_password": "Current password is incorrect.",
+  "password_too_short": "Password must be at least 8 characters.",
+  "username_invalid": "That username isn't valid.",
+  "username_taken": "That username is already taken.",
+  "email_invalid": "Enter a valid email address.",
+  "email_taken": "That email is already in use.",
+  "invalid_token": "That link has expired or already been used. Request a new one.",
+  "invite_invalid": "That invite has expired or already been used.",
+  "invite_required": "An invite is required to register on this server.",
+  "last_admin": "Can't demote or delete the last admin.",
+  "no_email_on_file": "No email is associated with that account.",
+  "not_configured": "This integration isn't set up yet.",
+  "validation": "Some fields aren't valid. Check and try again.",
+  "missing_fields": "Required fields are missing.",
+  "missing_query": "Search needs at least one keyword.",
+  "invalid_id": "Invalid identifier.",
+  "invalid_body": "Couldn't read the request.",
+  "bad_request": "Invalid request.",
+  "bad_body": "Couldn't read the request.",
+  "bad_kind": "Invalid request type.",
+  "bad_paging": "Invalid page size or offset.",
+  "bad_reason": "Invalid quarantine reason.",
+  "mbid_required": "An MBID is required for this lookup.",
+  "system_playlist_readonly": "System playlists can't be edited directly.",
   "connection_refused": "Couldn't reach the server. Check the URL and try again.",
   "lidarr_unreachable": "Lidarr is unreachable right now. Try again, or check Admin → Integrations.",
   "lidarr_disabled": "Lidarr integration is not enabled.",
@@ -12,5 +40,9 @@
   "album_mbid_missing": "This track has no Lidarr album to remove.",
   "request_not_pending": "This request is no longer pending.",
   "request_not_found": "That request no longer exists.",
-  "track_not_found": "That track no longer exists."
+  "track_not_found": "That track no longer exists.",
+  "album_not_found": "That album no longer exists.",
+  "artist_not_found": "That artist no longer exists.",
+  "playlist_not_found": "That playlist no longer exists.",
+  "user_not_found": "That user no longer exists."
 }