chore: add ethereum string

Author: wackerow

src/intl/en/common.json

@@ -79,6 +79,7 @@
   "enterprise-private": "Enterprise - Private Ethereum",
   "esp": "Ecosystem Support Program",
   "eth-current-price": "Current ETH price (USD)",
+  "ethereum": "Ethereum",
   "ethereum-basics": "Ethereum basics",
   "ethereum-brand-assets": "Ethereum brand assets",
   "ethereum-bug-bounty": "Ethereum bug bounty program",