Replace 'Paste with credit' text in toolbar menu with icon

[BjornW]

We need an icon to replace the 'paste with credit' text in the toolbar. I'm not sure how I would indicate a 'past with credits' vs a regular paste in an icon of roughly 16x16 or 26x26 pixels
https://help.libreoffice.org/Common/Change_Icon). @artfwo suggested a clipboard with Commonsmachinery's logo. IMHO that's fine for now until we have though of something better (if there is anything better).

[BjornW]

I have a suggestion for an icon based on the Noun Project:

• http://www.thenounproject.com/term/clipboard/28307/
  I like that this clipboard (THE icon most used for paste actions) has an image on it instead of lines, so it differentiates from the myriad of paste icons and connects more with the current abilities of the tool. Btw it's a CC-BY licensed icon @artfwo @jonasob @petli What do you guys think about this?

ps: Whatever icon we pick, it needs to be recognizable in 16x16 or 26x26 pixels. I don't think we need to put loads of effort in creating an icon at this stage and I prefer re-using something which is already available. When the PoC becomes more of an MVP we can adjust the icon in line with the visual language of the MVP and gather some data on how recognizable the icon is.

[artfwo]

I like the idea. Shouldn't be much effort to draw something similar in the style of the default LO icon theme too.