public_plans view according to gettext. DMPRoadmap/roadmap#167

Updated projects_helper by renaming 'project_list_column_body' to 'plan_list_column_body'. updated references to that code block. moved hard-coded 'Unknown' to locale files. Added tests for projects_helper

added theme unit tests and started cleanup of remaining existing tests

finsihed adding visibility to project details page as radio button options. Updated public DMPs page to work with new visibility and moved it to the static pages controller since it falls outside of normal security. Updated all locale files accordingly