feat: add Etoplatezhi payment provider support

- Add etoplatezhi to METHOD_LABELS for stats charts
- Add PaymentMethodIcon case with green gradient SVG
- Add payments_etoplatezhi to admin settings tree
- Add i18n keys in all 4 locales (en, ru, zh, fa)

src/locales/en.json

@@ -674,6 +674,9 @@
       "aurapay": {
         "description": "Pay via AuraPay"
       },
+      "etoplatezhi": {
+        "description": "Pay via Etoplatezhi"
+      },
       "apple_iap": {
         "description": "Pay via Apple In-App Purchase"
       }
@@ -1998,6 +2001,7 @@
         "payments_paypear": "PayPear",
         "payments_rollypay": "RollyPay",
         "payments_aurapay": "AuraPay",
+        "payments_etoplatezhi": "Etoplatezhi",
         "payments_apple_iap": "Apple IAP",
         "subs_core": "Core",
         "subs_trial": "Trial",