feat: sharing improvements

[lidel]

This PR brings two quick fixes that we need to make ipfs/ipfs-companion#810 more useful:

• Closes Files: better labels for copying shareable link and CID #1327 by improving labels in context menu.
  Main challenge was the difference between Copying CID and "Share". This PR removes unknown what "Share" means. We now set expectation that user will get a "shareable link":

  

• Closes Files: shared link should include filename #1346 by appending ?filename= when getting "Share link" for a single file:

  
  Demo: https://ipfs.io/ipfs/QmUwrKrMTrNv8QjWGKMMH5QV9FMPUtRCoQ6zxTdgxATQW6?filename=250px%D9%8A%D9%88%D8%B3%D9%81_%D8%A7%D9%84%D9%88%D8%B2%D8%A7%D9%86%D9%8A_%D8%B5%D9%88%D8%B1%D8%A9_%D9%85%D9%84%D8%AA%D9%82%D8%B7%D8%A9_%D8%A8%D9%88%D8%A7%D8%B3%D8%B7%D8%A9_%D9%85%D8%B1%D8%B5%D8%AF_%D9%87%D8%A7%D8%A8%D9%84_%D8%A7%D9%84%D9%81%D8%B6%D8%A7%D8%A6%D9%8A_%D8%AA%D9%88%D8%B6%D8%AD_%D8%B3%D8%AF%D9%8A%D9%85_%D8%A7%D9%84%D8%B3%D8%B1%D8%B7%D8%A7%D9%86%D8%8C_%D9%88%D9%87%D9%88_%D8%A8%D9%82%D8%A7%D9%8A%D8%A7_%D9%85%D8%B3%D8%AA%D8%B9%D8%B1_%D8%A3%D8%B9%D8%B8%D9%85._.jpg

[hacdias]

LGTM! Thanks!!!