Follow requests asked again, and followed accounts found by name

A server can take a Follow with 202 and drop it afterwards, as Pleroma does
while it cannot fetch our actor; the request then stayed pending for good.
Following again now sends an unanswered request once more, the same
activity, at most once an hour (a delivery's `again` key).

accounts/search takes following=true: only accounts the persona follows,
by the start of their name, display name or server, never resolved; a
client fills a list with it. "already take" becomes "already taken".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub/Services/ClientToServer/Private/IPrivateAvatarUsersService.cs

@@ -52,7 +52,7 @@ namespace PrivaPub.Services.ClientToServer.Private
 					return result.Invalidate(_localizer["The username may contain only letters, digits and underscores."]);
 
 				if (await _localActors.IsUserNameTaken(userName, default))
-					return result.Invalidate(_localizer["The username '{0}' is already take.", userName]);
+					return result.Invalidate(_localizer["The username '{0}' is already taken.", userName]);
 
 				if (!await IsValidRootUser(form.RootId))
 					return result.Invalidate(_localizer["You can't do this action because of your account status."]);
@@ -71,7 +71,7 @@ namespace PrivaPub.Services.ClientToServer.Private
 				};
 				newAvatar.ID = (string)newAvatar.GenerateNewID();
 				if (!await _localActors.TryReserveUserName(userName, LocalActorKind.Person, newAvatar.ID, default))
-					return result.Invalidate(_localizer["The username '{0}' is already take.", userName]);
+					return result.Invalidate(_localizer["The username '{0}' is already taken.", userName]);
 				if (form.Settings is { IsDefault: false })
 					Apply(newAvatar.Settings, form.Settings);