[1.6.x] Fixed spelling ("dependant" -> "dependent")

Dependent means reliant on.
A dependant is a person like a child or spouse.

Thanks Andrew Wilcox for the report.

Backport of 090315f5df from master

django/utils/cache.py

@@ -168,7 +168,7 @@ def _i18n_cache_key_suffix(request, cache_key):
         cache_key += '.%s' % getattr(request, 'LANGUAGE_CODE', get_language())
     if settings.USE_TZ:
         # The datetime module doesn't restrict the output of tzname().
-        # Windows is known to use non-standard, locale-dependant names.
+        # Windows is known to use non-standard, locale-dependent names.
         # User-defined tzinfo classes may return absolutely anything.
         # Hence this paranoid conversion to create a valid cache key.
         tz_name = force_text(get_current_timezone_name(), errors='ignore')

django/utils/feedgenerator.py

@@ -33,7 +33,7 @@ from django.utils.six.moves.urllib.parse import urlparse
 from django.utils.timezone import is_aware
 
 def rfc2822_date(date):
-    # We can't use strftime() because it produces locale-dependant results, so
+    # We can't use strftime() because it produces locale-dependent results, so
     # we have to map english month and day names manually
     months = ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec',)
     days = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')