Input setup wording improvements

The wording of the lines in following dialog makes it hard (for me) to distinguish first three lines. The repeated stream name and similar endings look like the first three lines are identical:

* Stream "tdvorak random stream" created!
* Stream "tdvorak random stream" started!
* Pipeline "tdvorak random stream" created!

## What?
I'd suggest changing the wording or at least verbs at the end of the line slightly, so it doesn't look that extremely similar.

## Why?
Originally I though that the first two lines are identical and repeated due to a bug somewhere.

## Your Environment

* Graylog Version: Graylog Cloud 7.0.0 (489)