Add languages configuration

config.example.json

@@ -1,4 +1,10 @@
 {
-    "owner": "123",
-    "token": "123"
+    "owner": "Discord ID of the bot owner(s)",
+    "token": "Bot token",
+    "languages": [
+        "Language whitelist, e.g.",
+        "haskell",
+        "python",
+        "Leave empty to enable all languages"
+    ]
 }

src/struct/LanguageHandler.js

@@ -11,7 +11,8 @@ class LanguageHandler extends AkairoHandler {
         classToHandle = Language,
         extensions = ['.js', '.ts'],
         automateCategories,
-        loadFilter
+        loadFilter = filepath =>
+            !this.client.config.languages.length || this.client.config.languages.includes(path.parse(filepath).name)
     }) {
         super(client, {
             directory,