Updated and refined Polish translation (basing on file from Transiflex last updated on November 17).
Clone changes done in Mezzanine's project template settings.
Register cartridge models for translation.
Base classes need to be registered for translation before their descendants.
Use TranslationAdmin as base for cartridge admins not deriving from DisplayableAdmin (falls back to admin.ModelAdmin if content translation is disabled).
Rerun ``makemessages``.
Translated a few new strings, removed some fuzziness and did a few minor corrections."
Plural of product in "Product category" sounds better.
Keywords translation.
Replicate changes from Mezzanine's project template settings.
Automatically run ``update_generated_fields`` after loading example fixture to simplify project setup.
Running ``update_generated_fields`` after ``createdb`` is needed even without the optional content (for the "shop" page's slug).
Mark fixed shop slugs for translation (docs: https://docs.djangoproject.com/en/dev/topics/i18n/translation/#translating-url-patterns).
Merge branch 'feature/translatable-shop-url-prefixes' into feature/polish-translation-update
Translated shop urls.
Mark fixed shop slugs for translation (docs: https://docs.djangoproject.com/en/dev/topics/i18n/translation/#translating-url-patterns).
Merge branch 'feature/translatable-shop-url-prefixes' into feature/polish-translation-update

Conflicts:
	cartridge/shop/urls.py
Mark fixed shop slugs for translation (docs: https://docs.djangoproject.com/en/dev/topics/i18n/translation/#translating-url-patterns).
Merge branch 'feature/translatable-shop-url-prefixes' into feature/polish-translation-update

Conflicts:
	cartridge/shop/urls.py
Store translated product descriptions and urls in cart (in case user changes language after adding a product).
New strings and some further adjustments with more context familiarity.