UI: Project view. Repository size links to files tab.

What does this MR do?

This MR edits the Project view replacing the link to the Files tab. Before, the repository size text "230 MB" linked to the files tab. With this MR, the text is changed to "Files (230 MB)". The usability is improved as it does not seem obvious that you can browse the file tree by clicking on the repository size.

Are there points in the code the reviewer needs to double check?

The commit is just a single line change, although my experience in this language is limited.

Why was this MR needed?

To improve the usability. Most of the users I have worked with did know that "123 commits" linked to the commit page, but they did not know that they could click on the repository size to see the Files panel.

What are the relevant issue numbers?

No issue has been created.

Screenshots (if relevant)

Before:

After: