Log Message:
Update gtk3 to 3.16.7

Overview of changes in GTK+ 3.16.7
==================================

* Bugs fixed:
 345345 PrintOperation::paginate is not emitted for class handler
 579466 gtk_entry_completion_insert_action documentation is misleading
 751721 No release event for shift key when both shift keys were pressed
 753621 Calculate screen physical size
 753628 user options of wrong printer are used
 753644 Switching from Multipress input method to None immediately kills...
 754535 Cursor disappears only on adding characters

* Translation updates:
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