Customizable default text of the reshared post

[ciubotaru]

TODO. Would be great to have an option allowing blog owners to add their own text (first of all hashtags) to the default text.

After a more careful thought this boils down to allowing bloggers edit the entire default text.

[ciubotaru]

No default pattern yet, but the text (i.e. post title) is customizable now (see 7a4b087).