Hide empty compte columns in the drill-down modal, rename its title

The modal's group is usually 2-4 rows touching only 1-2 comptes -- unlike
the main table (always all 8, so columns line up across every row/year),
showing all 8 there was mostly empty columns. New modalComptes computed
filters allComptes down to whichever actually carry a value somewhere in
filterEntreeGroup.

Also renamed "Entrée + sorties liées" to "Entrées et sorties liées"
(title and footer label) to match multi-entrée groups.

web/modules/custom/figli_compta_ledger/js/home.js

@@ -471,6 +471,15 @@
         const sorties = pool.filter((r) => r.type !== 'entree' && r.entreeLieeIds.some((id) => entreeIds.has(id)));
         return [...entrees, ...sorties];
       },
+      // Which comptes actually carry a value somewhere in the drill-down
+      // group -- unlike the main table (always all 8, so columns line up
+      // across every row/year), this modal's group is usually 2-4 rows
+      // touching only 1-2 comptes, so the other 6+ empty columns are pure
+      // clutter.
+      modalComptes() {
+        if (!this.filterEntreeGroup) return [];
+        return this.allComptes.filter((c) => this.filterEntreeGroup.some((r) => r.parCompte[c] !== undefined));
+      },
       filteredRows() {
         return this.rows.filter((r) => {
           if (this.filterCompte && r.parCompte[this.filterCompte] === undefined) return false;