Code more defensively in image views/forms

Fixes bug 1229090 and fixes bug 1220315

Change-Id: I86636ea855e969abd65b5df6c3cf8ea0ff66dc28
Import translations from Transifex for Havana RC1

* Import ~100% completed translations
* Update language list in openstack_dashboard settings.py
* Remove all old translations in the previous release
* Remove English compiled PO (MO) files

Closes-Bug: #1229993
Change-Id: I06cfd7f8a4cdd650f43010836947b54bd8f5aee4
Create links between FWaaS resources

Part of blueprint fwaas-horizon

This commit creates cross links between FWaaS resources
and resolves FWaaS resource UUID in tables to its name.
This helps users to track FWaaS resources.

This commit also improves an error handling when an error occurs
during retrieving a resource detail via API call.
While previously a detail page without item values is displayed,
now the index page is displayed for such case.

Closes-Bug: #1229433

Change-Id: I4357b5c275ab75163f0afc7158b4c1edb8cecd6c
Merge "Import translations from Transifex for Havana RC1"
Merge "Create links between FWaaS resources"
Merge "Code more defensively in image views/forms"