Add English translation for block confirmation

src/i18n/en.json

@@ -914,6 +914,10 @@
     "approve": "Approve",
     "block": "Block",
     "blocked": "Blocked!",
+    "block_confirm_title": "Block confirmation",
+    "block_confirm": "Do you really want to block {user}?",
+    "block_confirm_accept_button": "Block",
+    "block_confirm_cancel_button": "Do not block",
     "deactivated": "Deactivated",
     "deny": "Deny",
     "edit_profile": "Edit profile",