Capitalizes the first character of the value.
    
    If the submitted value isn't a string, returns the `failure_string` keyword
    argument.
    
    Cribbs from django's default filter set

def capfirst(value, failure_string='N/A'):
    """
    Capitalizes the first character of the value.
    
    If the submitted value isn't a string, returns the `failure_string` keyword
    argument.
    
    Cribbs from django's default filter set
    """
    try:
        value = value.lower()
        return value[0].upper() + value[1:]
    except:
        return failure_string