fix: Improve consistency on CLI help (#4112)

This makes the english consistent on flags, and improves
the contrast for the placeholder color on dark themes.

cli/users.go

@@ -8,7 +8,7 @@ import (
 
 func users() *cobra.Command {
 	cmd := &cobra.Command{
-		Short:   "Create, remove, and list users",
+		Short:   "Manage users",
 		Use:     "users",
 		Aliases: []string{"user"},
 	}