Byt ikon för .odt-export

[Gonte]

Inkom via e-post #81919
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I notice two errors, one easy to fix the other harder to fix.

1) The easy one is that the icon for exporting pad to the opendocument
format uses a small image of the Linux Mascot, Tux.

While there are interrelationships between open source, open standards
and linux, open standards are separate from both open source and linux.

Any project or product, whether open or closed, can make use of open

standards. Further, the main (perhaps sole) opponent to open standards
has spent a lot on confusing and conflating the separate concepts.
 http://www.expressen.se/ledare/1.1663751/johanna-nylander-microsoft-hotar-var-demokrati

It'd be really great to thus use a distinct icon for the opendocument
format. The Piratpartiet could make their own or grab one of these:

 http://www.catnip.co.uk/opendocument/icons/
 http://www.catnip.co.uk/opendocument/graphics/x-odf-document.png

If the icon could be fixed upstream in Etherpad, that would be even better.