Merge pull request #339 from gwb3/update-spanish-translation

Update Spanish Translation
Switch to kramdown for markdown in _config.yml
(Maruku is obsolete and karmdown is required for toc in the future)
Fix UTC time handling in events.rb (fixes #344)
Rename and validate utcoffset variable
Merge pull request #343 from gwb3/update-translation-script-instrux

Add clarification for running translation update script from web root.
Update German Translation