add hostingpackages api doc

- add to docs/code.rst toctree
- add new docs/code/hostingpackages.rst containing the autodoc directives
- document undocumented code in hostingpackages app
- update translation templates

gnuviechadmin/hostingpackages/models.py

@@ -144,8 +144,28 @@ class MailboxOption(MailboxOptionBase, HostingOption):
 
 
 class CustomerHostingPackageManager(models.Manager):
+    """
+    This is the default manager implementation for
+    :py:class:`CustomerHostingPackage`.
+
+    """
 
     def create_from_template(self, customer, template, name, **kwargs):
+        """
+        Use this method to create a new :py:class:`CustomerHostingPackage` from
+        a :py:class:`HostingPackageTemplate`.
+
+        The method copies data from the template to the new
+        :py:class:`CustomerHostingPackage` instance.
+
+        :param customer: a Django user representing a customer
+        :param template: a :py:class:`HostingPackageTemplate`
+        :param str name: the name of the hosting package there must only be
+            one hosting package of this name for each customer
+        :return: customer hosting package
+        :rtype: :py:class:`CustomerHostingPackage`
+
+        """
         package = CustomerHostingPackage(
             customer=customer, template=template, name=name)
         for attrname in ('description', 'diskspace', 'diskspace_unit',