Rewritten miq_ae_customization view to HAML + added gettext calls

Parent issues: #1001, #1025
I'd like this to be more uniform. Ok, the primary goal is to get gettext calls in, but let's add also more consistency to the code. Why do we have some of the `td`s one-liners and others are multiline here?

I am going to merge this anyway after some more checking. But just take a bit more care about these small things, please.