We should use ugettext_lazy to let users in different languages
get correct translation.Though in views or similar places
we can use ugettext with no problems, we should make code
style consistent.
This also fix the issues that the django proxy objects appear on the
launching instance page instead of translated strings. Now the
translated quota strings are handled correctly.
Fixes: bug #1178722
Change-Id: I76f0d31e6546d70e5ece7e86a06f7eefd04861d2
08e6ed7392