Cannot change the title of an application homepage

Steps to reproduce:

• Create an application using app within minutes, using the name "ProcessSheets"
• add a couple of fields, go through with the wizard to the end. Add a description for the homepage
• the displayed title for the application is now "ProcessSheets"
• I actually realise that it would be much better if I had a space in the title, like "Process Sheet", and I would like to change it

Actual result

• In the edit application wizard, I cannot find any way to edit the displayed title of the application

Expected result:

• In the presentation step of the application, I would like to have a way to set the title of the application homepage
• This change should also reflect in the name of the application presented in the Applications panel, on the left

Note that this issue is even more since when the only option visible on the screen to rename the homepage is the "Rename" button of the page administration menu, and using it causes XWIKI-13352 .