Log Message:
Changes 1.8.9:
Fixed a regression that caused the “user-tools” items to display on \ 
the admin’s logout page.
Fixed a crash in the translations system when the current language has no \ 
translations.
Fixed a regression that caused the incorrect day to be selected when opening the \ 
admin calendar widget for timezones from GMT+0100 to GMT+1200.
Fixed a regression in 1.8.8 causing incorrect index handling in migrations on \ 
PostgreSQL when adding db_index=True or unique=True to a CharField or TextField \ 
that already had the other specified, or when removing one of them from a field \ 
that had both, or when adding unique=True to a field already listed in \ 
unique_together.
Fixed a crash when using an __in lookup inside a Case expression.
Fixed a crash when using a reverse OneToOneField in ModelAdmin.readonly_fields.
Fixed a regression in Django 1.8.5 that broke copying a SimpleLazyObject with \ 
copy.copy().
Fixed the contrib.gis map widgets when using USE_THOUSAND_SEPARATOR=True.