Shorter / Iconized column titles

Hi, is it possible to have shorter column titles, or icons instead of text?
The most obvious one for me now is perhaps to change "Language" into a globe icon. I see the attachment column has an icon only, so I thought if that's possible, it would optimize space of that's applied to other columns as well..

And while I'm at it, is there a way I can show only the date without the time in the "Date Modified" column?
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