Cleanup of jasper.py

If cleaned up `jasper.py`.

If have also some questions for futher cleanup.
We can, but I learned that it's bad style, because this will make it impossible to translate if we ever add localization (because other languages might have a different word order).

We could also add brackets:
```Python
salutation = ("How can I be of service, %s?" % self.config["first_name"]) if 'first_name' in self.config else "How can I be of service?"
```
Or use the long version:
```Python
if 'first_name' in self.config:
    salutation = "How can I be of service, %s?" % self.config["first_name"]
else:
    salutation = "How can I be of service?"
```
What do you think?