input: 2 Hire a designer to create your poster
fixed: 2. Hire a designer to create your poster.

input: Highlighted fields are required
fixed: Highlighted fields are required.

input: The 3 scarce radiobuttons such as changing only the interval
fixed: The 3 scarce (radiobuttons) such as changing only the interval.

input: The Scrum Product Owner is the person who takes responsibility for the business value of the project prioritizes constantly and conveys the specifications for the solution
fixed:
The Scrum Product Owner is the person, who takes responsibility for the business value of the project, prioritizes constantly and conveys the specifications for the solution.