Rebon app-v1.8.11

feat(i18n): Word group memory as revisions

The desktop memory tab now folds a replaced entry under the entry that
revised it and lists memory by time or by author. Add the strings for
the grouping switch, the in-order heading and the revised count, and
say "revises" / "revised by" where the strings said "replaces". Drop
the history toggle, replaced-section and per-row author strings the
old tab used.