okapi r871: protection_areas docs and translation
Merge branch 'stable'
squashed redundant search code, search fixes;
update #259, update #253

- integrated redundant parts of lib/search.*.inc.php into search.php
- added some translations for LOC and KML
- added "locked" state to LOC output
- appended state of inactive caches to KML cache names
- display selected distance search unit in HTML and XML output
- improved GPX Google search link for protection areas
- one more searching improvement (forgotten what it was ...)