Add strings for /config

bot/en.json

@@ -7,6 +7,18 @@
         "ping": {
             "title": "Latency",
             "body": "WebSocket: {{latency.ws}}\nRound trip: {{latency.roundtrip}}"
+        },
+        "config": {
+            "title": "Configuration",
+            "unknown_setting": "Unknown setting \"{{setting}}\"",
+            "setting_info": {
+                "title": "Setting: {{setting}}",
+                "current": "Current value: {{value}}",
+                "options": "Available options: {{options}}"
+            },
+            "invalid_value": "The value you provided is not applicable to this option.\nAllowed values are: {{values}}",
+            "setting_updated": "Setting {{setting}} has been changed from {{old}} to {{value}}.",
+            "setting_unchanged": "Setting {{setting}} is already set to {{value}}."
         }
     },
     "command_failed": {