i18n: relabel X/Z report UI to plain language (keep X/Z in code)

The "X-REPORT / Z-REPORT" labels are till-accounting jargon operators don't
recognize. Relabel the user-facing strings to plain wording in both catalogs —
SQ: "ARKËTIMET DERI TANI" / "MBYLLJA E TURNIT"; EN: "TAKINGS SO FAR" /
"SHIFT CLOSE". The X/Z naming stays in code (xReport/zReport keys, the
shift_z_report event, currentReport) and the wiki.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

apps/web/src/lib/i18n/en.ts

@@ -527,11 +527,11 @@ export const en: Catalog = {
     voucherRecorded: "Voucher {{no}} recorded. Drawer now {{amount}}.",
     enterPositive: "Enter a positive amount.",
     drawerNow: "Drawer now {{amount}}.",
-    zReport: "Z-REPORT",
+    zReport: "SHIFT CLOSE",
     viewTakings: "Takings so far",
-    xReport: "X-REPORT (so far)",
+    xReport: "TAKINGS SO FAR",
     asOf: "as of",
-    xReportHint: "Read-only snapshot — nothing is recorded. The Z-report at close will sign these figures.",
+    xReportHint: "View only — nothing is recorded. These figures are signed when the shift is closed.",
     payments: "Payments:",
     cash: "Cash:",
     card: "Card:",