docs: Add gettext to prereqs
- An AWS IAM role to give to the Cluster API control plane.
- [Minikube][minikube]
- [kubectl][kubectl]
+- [gettext][gettext] on MacOS (`brew install gettext && brew link --force gettext`)
### Optional
@@ -293,3 +294,4 @@ kubectl logs -c aws-cluster-controller -f `
[kubectl]: https://kubernetes.io/docs/tasks/tools/install-kubectl/
[aws_powershell]: (https://docs.aws.amazon.com/powershell/index.html#lang/en_us)
[aws-vault]: https://github.com/99designs/aws-vault
+[gettext]: http://brewformulas.org/Gettext
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