GUI-1056: Link to contributing translations wiki page in readme
Merge pull request #771 from eucalyptus/GUI-1056

GUI-1056: Link to contributing translations wiki page in readme
GUI-1065: Add missing i18n:translate and i18n:domain attributes

- Also expands Spanish translation coverage a bit
GUI-1065: Add missing i18n:domain attributes and remove stray i18n:translate tags
Merge pull request #773 from eucalyptus/GUI-1065

GUI-1065: More i18n fixes
merged develop