GUI-1057: Configure locale negotiator, i18n domain, and translation directories
- Allow translation strings to be displayed when marked in .py files
- Add a few Spanish translations to login form for testing purposes
GUI-1057: Add i18n:domain attribute to allow translations to display in .pt files
GUI-1057: i18n-enable a few more strings on login page
GUI-1057: Remove unneeded add_renderer_globals and add_localizer subscribers.  Add Spanish translations for JS and HTTPS warnings on login page.
Merge pull request #766 from eucalyptus/GUI-1057

GUI-1057: Properly configure i18n machinery and test with a few Spanish translations