Unshare a shared poll

[DominikWA]

I have many shared polls from other users, but i can not unshare/delete or hide them. The list of polls is getting to large for me to have a good workflow.

An other idea would be to move expired polls in a separate folder, like the public polls or other folders.

[dartcafe]

Something, we didn't have in mind. In #875 we changed the folders (filters). I think, the folder "relevant" could ignore expired polls and we can add explicit folder for expired polls.
Maybe devided in "recently expired" and "old polls"

[dartcafe]

Changed navigation and added a section for expired polls. The section relevant ignores expired polls. Other sections will still display expired polls.

[dartcafe]

@DominikWA Does the new filtering solve this problem? Can be tested in latest beta.