Add upload file to edit button + 4 changes (for Linh)

site [login to view URL] - The edit page needs to have an upload file form. (discussed with Linh) - When a new entry is added the authors are not added, this needs to be fixed so that authors appear - There is no way to edit the authors on the edit page, right now it just shows a blank field. Please add a field to edit authors. - When a user is not allowed to edit a page they get a message that says: "You are not allow to edit the [login to view URL] operation is only perform by author or Super administrator." change to: "You are not allowed to edit the content. Editing can only be performed by the Author." - On the same page (where user is not allowed to edit) there is a link "back to browsing" this link does not work, it goes to a blank wrapper. - When a user selects an entry and click on "View Selected Model" they go to a detail page. On this page is a link "back to browsing" this link does not work and goes to a blank wrapper. - In models, the author column is not the correct size. The names are being cut off on the left. The column should be directly under the title.