Revert "swap pin for heart [ci skip]"

This reverts commit 488e064e.

Conflicts:

	app/views/templates/likes_info.jst

Revert "reference pin icon in mobile view [ci skip]"

This reverts commit 9377dd30.

Revert "first pass at strickly user level rename from like => pin. still need to update assets"

This reverts commit d06ccb9b.

Conflicts:

	config/locales/diaspora/en.yml

add heart icon back