Added meridianSeparator and submitMode

**MeridianSeparator** is to support '.' for Albanian locale (sq, sq_AL).

**SubmitMode** determines the value actually submitted with the form and has 3 values: 
    
    'default' (as before, untouched, same as display value)
    'iso' (ISO8601, always with seconds)
    'iso-auto' (ISO8601, with seconds only if displayed)