fix(i18n): remove duplicate subscription.servers string key

The key existed as both a string and an object in subscription
section, causing i18next to return an object instead of a string.
Removed the redundant string — serversLabel is used for plain text,
plural suffixes (_one/_few/_many/_other) handle counted usage.

src/locales/ru.json

@@ -165,7 +165,6 @@
     "devices_one": "{{count}} устройство",
     "devices_few": "{{count}} устройства",
     "devices_many": "{{count}} устройств",
-    "servers": "Серверы",
     "serversLabel": "Серверы",
     "servers_one": "{{count}} сервер",
     "servers_few": "{{count}} сервера",