Improve installation questions

[m-green]

What should change

During the TDT install process, some of the questions users are asked are not written in a user-focused way. For example: 'What is the canonical hostname of your application?'. It'd be good to rewrite the questions so they're in plainer language.

User need

Users may fail to understand the questions and be blocked from installing the TDT, because they're not sure how to answer.