i18n(marketing-channels): +5 translations for columns + labels + empty state

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lang/en.json

@@ -921,7 +921,7 @@
   "Last login at": "Last login",
   "Lasă gol = se aplică mereu. Combină condițiile pentru a ținti situații specifice.": "Empty = always applies. Combine conditions to target specific cases.",
   "Lead": "Lead",
-  "Lead-uri": "Lead-uri",
+  "Lead-uri": "Leads",
   "Lead-uri pe sursă": "Leads by source",
   "Leads": "Leads",
   "Legendă": "Legend",
@@ -1958,7 +1958,7 @@
   "Vehicul existent": "Existing vehicle",
   "Vehicul nou": "New vehicle",
   "Venit": "Revenue",
-  "Venit generat": "Venit generat",
+  "Venit generat": "Revenue generated",
   "Venit luna curentă": "Current month revenue",
   "Venit luna trecută": "Venit luna trecută",
   "Venit manopere": "Labor revenue",
@@ -2045,7 +2045,7 @@
   "buc": "pcs",
   "call": "Call",
   "canal": "channel",
-  "canale marketing": "canale marketing",
+  "canale marketing": "marketing channels",
   "capacitate": "capacity",
   "cerere": "lead",
   "cereri": "leads",