add spreadsheet_dashboard_pos_cooperative & pos_dashboard_cooperative

spreadsheet_dashboard_pos_cooperative/readme/ROADMAP.rst

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+* Period-over-period comparisons on the scorecards (the BI brief shows
+  "X% desde el último periodo" arrows on every KPI). In o-spreadsheet
+  this is wired through ``baseline`` references plus a comparison
+  range on the date global filter. Postponed until the four dashboards
+  are validated by the customer in production.
+
+* Quarter-level selection (*Q1..Q4*) on the ``Period`` filter. The
+  o-spreadsheet date filter in Odoo 16 only accepts a single
+  ``rangeType`` per filter; we picked ``month`` because it is the
+  finest granularity. A second date filter with ``rangeType:
+  "quarter"`` would coexist visually but duplicate the year picker,
+  which the customer rejected. Revisit in Odoo 17 where the filter
+  UI allows choosing the granularity dynamically.
+
+* Rolling-window date filter (*Last 30 / 90 / 180 days*) as an
+  alternative to the month picker. Same limitation as above (one
+  ``rangeType`` per filter).
+
+* "Sales concentration" KPI on the Categories dashboard: share of
+  sales captured by the top 20% of buying members. The Top buyers
+  pivot already exists in the Members dashboard; only an aggregation
+  formula plus a scorecard would be needed.
+
+* Stricter definition of **Members penetration** as ``distinct member
+  buyers / total members in the cooperative`` (instead of the current
+  ``/ total buyers in the period``). Requires sourcing the total from
+  ``share.line`` rather than from ``report.pos.order``.
+
+* Translate ``spreadsheet.dashboard.name`` / ``spreadsheet.dashboard.group.name``
+  so the entries in the *Dashboards* menu render in the user's
+  language (currently always English: *POS Overview*, *POS Members*,
+  etc.). Blocked upstream: the core ``name`` fields are not declared
+  ``translate=True``. Either patch the core fields downstream or rename
+  the records to the customer's primary language in the XML.
+
+* Add Galician, Catalan, French, Dutch and Croatian translations.
+  Spanish (``es.po``) ships out of the box. The other locales can be
+  produced from the same ``.pot`` by translating each ``msgstr``.