Fixes #732 Modlog, $lang->post not defined

#732 feature branch
Fixes moderation.php wrong code
Forgot $lang->post
Fixes #732 Modlog, $lang->post not defined

Only makes sense to have a pid stored in soft delete and restore (this
commit fixes that)
Unnecessary pid in edit_subject
Merge pull request #1074 from PirataNervo/featurefix-1071

Fixes #732 Modlog, $lang->post not defined