fix: show locations count instead of servers on tariff cards

servers_count already represents squad count on backend.
Renamed display labels to "locations" on tariff cards and
confirmation view. Server names still shown in subscription card.

src/locales/en.json

@@ -243,6 +243,9 @@
     "serversLabel": "Servers",
     "servers_one": "{{count}} server",
     "servers_other": "{{count}} servers",
+    "locationsLabel": "Locations",
+    "locations_one": "{{count}} location",
+    "locations_other": "{{count}} locations",
     "traffic": "Traffic",
     "unlimited": "Unlimited",
     "used": "Used",