Prettify all the things (part 8)

What does this MR do?

Prettifes remaining frontend modules (letter I through Z)

What are the relevant issue numbers?

gitlab-ce#52764

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides