luci-app-usteer: Removed save/apply button on status pages, and added...

luci-app-usteer: Removed save/apply button on status pages, and added "friendly" error message if usteer not running
Added refresh of status page

Add the template pot file that is needed to start translating the app.

Co-authored-by: Sergey Ponomarev <stokito@gmail.com>
Co-authored-by: Miguel Angel Mulero Martinez <migmul@gmail.com>
Signed-off-by: Ramon Van Gorkom <Ramon00c00@gmail.com>