Regarding the correct form of don't panic, I am with you. I have absolutely no clue when it comes to Latin {on the other hand I can talk my way out of any situation in more than a few south Indian languages}. I was fooling around with Google translate and wanted a short form and settled on "ne pavor".

I used the Greek transliteration because I absolutely love how Greek letters look in latex.

Regarding the "h" : When I was choosing the nick name I thought there was an "h" in zaphod and realized the mistake way too late to change it in so many different places.