Revert "search_inside has div.umlaut_section even on spinner, for proper spacing"

This reverts commit e921b095ebf253a0077e7df116983af77ef4a69a.
correct nesting, search_inside has div.umlaut_section even on spinner, for proper spacing
Mute out weird section sub-heading that maybe isn't a great UI anyway
more consistent naming of things and thing containers in search-inside and fulltext container-level warning