Update `English` translation

Currently translated at 99.4% (540 of 543 strings)

Translation: Wiki-Bot/Discord
Translate-URL: https://weblate.frisk.space/projects/wiki-bot/discord/en/

i18n/en.json

@@ -414,6 +414,7 @@
         "topic": "Topic:",
         "users": "Active users:",
         "vertical": "Vertical:",
+        "walls": "Message wall posts",
         "wikiid": "Wiki ID:",
         "yes": "Yes"
     },