Easyling Changelog - v398

New features:

261 feature Workbench add ability to filter for SEO-significant items, add display of segment source tag
254 feature backend Dropbox integration Phase I
259 feature workbench SEO-specific filters implemented
262 feature backend Significant speedup of HTML translation

Fixes:

258 fix Workbench Linked entries' updates handled in batches, with duplicates being discarded
253 fix dashboard Audit Log page won't display faulty data for removed project TMs
262 fix backend fix an issue when clearing binary caches