Fix untranslatable strings #2

Hi!

Thanks for the last merger and sorry for the little bug (assuming that var "lang" was global), but I'm not a javascript expert at all :-(!
While reviewing the German App Version I noticed 3 minor translation issues which I tried to fix! 

-) As "None" appeared twice and as for German I need to distinguish I introduced "n/a" instead of "None" for the master station. I don't know if "n/a"/"not applicable" fit in here?
-) To translate the "Submit" Button for the rain delay I found no other way than using jquery/append. I don't know if this appropriate for your!

Thanks & kind regards
// Clemens