Add "Edit" button to posts

[steffen]

What

Post authors and moderators should be able to edit posts from any post list.

Why

When the post authors or moderators see posts, they may want to edit them.
Having a button allows to do that by just one tap.
The alternative for authors would be going to the "My posts" tab and search for the respective post.
There is no alternative for moderators at the moment.

How

Add an "Edit" (pencil?) button to posts.

Happy to create a mockup and provide more information if anybody is interested in working on this issue.