Improve upload notification box

[CarstenGrohmann]

The icon in the dialog is nearly invisible as the red drawn box shows. Please choose a better visible icon.

The current text Uploading <number> files is inspecific, because you can see if this is the absolute number of files or the outstanding files to upload. Thereby I suggest to change it to a more specific message like

• Uploading file <current number> of <absolute count>

or

• <number of outstanding files> files left to upload

Regards, Carsten

[cdujeu]

Should have been fixed already.