Log Message:
Update to 2.18.8:

Overview of Changes from GTK+ 2.18.7 to 2.18.8
==============================================

* Bugs fixed:
 612066 empathy hangs when clicked on information about contact...
 569042 gailbooleancell does not seem to attend to changes...
 609650 GtkPlug Embedded signal is not emitted when plug/socket...
 609744 crash at parse_data_for_row_pseudocolor
 609952 destroying a notebook window when the last tab got dragged...
 610141 gtk_assistant_get_nth_page() function fails to deliver...
 610184 gtk_assistant_set_current_page() segfaults...
 610381 More space between toolbar icon and label
 610632 gtk_info_bar_set_default_response problem
 611686 focus_in/focus_out in gailtreeview.c should return FALSE...
 612119 Do not scroll when middle pasting
 612308 GTK+ Build error: redefinition of 'struct IPrintDialogCallback'
 612346 gdk_window_set_icon_name doesn't work
 612505 Entry layout not updated when underlying buffer changes
 598881 Unimplemented GdkWindowImplIface methods crash gimp on OSX

* Updated translations:
 Bengali India
 Low German
 Oriya
 Polish