Exported project file name should include the project name in downloaded file, it will be easy to identify the project file with name _ id .
Steps to reproduce:
Go to the zanata home.
Click on dashboard.
Click on projects tab.
Select any of the project.
Click on "..." after setting on right top corner to export project tmx
Click on export project.
Pop will appear with ok and cancel button,
Click on ok.
Observe the file name.
Exported project file name include the project_id.
because of project id it is difficult to identify the downloaded project file if we have already downloaded many project files.
The exported project file name should include the project name also with project id.
Attached screen captured for more ref.
Fedora 25 + Firefox 50 (64 bit)