fix function names and remove flashMsg code duplication

peach-web/static/js/change_password.js

@@ -1,6 +1,16 @@
 /*
-*   behavioural layer for the `change_password.html.tera` template,
- */
+
+behavioural layer for the `change_password.html.tera` template
+
+ - intercept button click for save (form submission of passwords)
+ - perform json api call
+ - update the dom
+
+methods:
+
+ PEACH_AUTH.changePassword();
+
+*/
 
 var PEACH_AUTH = {};
 
@@ -43,5 +53,5 @@ PEACH_AUTH.changePassword = function() {
     });
 }
 
-var passInstance = PEACH_AUTH;
-passInstance.changePassword();
+var changePassInstance = PEACH_AUTH;
+changePassInstance.changePassword();