Save icon is not intuitive for newcomers

[Félix Brezo]

The save icon (showed for instance in Scratch and stored in) mainly represents an arrow pointing down which I suppose is intended to represent that the document is stored locally. It is a very similar icon to:

/usr/share/icons/elementary/actions/128/document-save.svg

In my experience, I have noticed that this icon is not intuitively perceived as a Save icon, but is more often linked to Download. In fact, this icon is the same as an icon named browser-download.svg:

> md5sum /usr/share/icons/elementary/actions/128/document-save.svg
5ae53ef1146a4dcf035482c5436406b1 document-save.svg
> md5sum /usr/share/icons/elementary/actions/128/browser-download.svg
5ae53ef1146a4dcf035482c5436406b1 browser-download.svg

I feel that maybe a clearer icon could be used to represent the Save action.