Fixed many typos in comments and docstrings.

Thanks Piotr Kasprzyk for help with the patch.

django/template/base.py

@@ -69,7 +69,7 @@ libraries = {}
 builtins = []
 
 # True if TEMPLATE_STRING_IF_INVALID contains a format string (%s). None means
-# uninitialised.
+# uninitialized.
 invalid_var_format_string = None
 
 

django/template/defaulttags.py

@@ -567,7 +567,7 @@ def cycle(parser, token, escape=False):
         {% endfor %}
 
     Outside of a loop, give the values a unique name the first time you call
-    it, then use that name each sucessive time through::
+    it, then use that name each successive time through::
 
             <tr class="{% cycle 'row1' 'row2' 'row3' as rowcolors %}">...</tr>
             <tr class="{% cycle rowcolors %}">...</tr>
@@ -944,7 +944,7 @@ def do_if(parser, token):
         {% endif %}
 
         {% if athlete_list and coach_list %}
-            Both atheletes and coaches are available.
+            Both athletes and coaches are available.
         {% endif %}
 
         {% if not athlete_list or coach_list %}