i18n all part

- forms for labels and helps
- views for success or warning messages
- apps and models verbose_names for admin

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

python3 compatibility

- Things are suggested in python3 porting guide.
https://docs.djangoproject.com/en/1.8/topics/python3/

1. adding ```from django.utils.encoding import
python_2_unicode_compatible```

2. ``` __str__``` instead of ```__unicode__```
https://docs.djangoproject.com/en/1.8/topics/python3/#str-and-unicode-methods

3. Adding ```from __future__ import unicode_literals``` at the top
of your Python modules
https://docs.djangoproject.com/en/1.8/topics/python3/#unicode-literals

4. Removing the `u` prefix before unicode strings;
https://docs.djangoproject.com/en/1.8/topics/python3/#unicode-literals

- also closed #66

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

sponsorship benefit relation administration

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

admin contact

Feedback from pycon development

```
commit eb3261c12c910ec562e016f10431cc48747baef8
Author: Dan Poirier <dpoirier@caktusgroup.com>
Date: Wed Aug 21 11:51:20 2013 -0400

Enhanced sponsor admin page

```

Signed-off-by: Hiroshi Miura <miurahr@linux.com>