fix(sounds): link custom sounds in language directories for Asterisk (v1.4.9)

src/SystemChecker.php

@@ -235,6 +235,9 @@ class SystemChecker
             if (is_dir($src) && !file_exists($dst)) {
                 @symlink($src, $dst);
             }
+            if (is_dir($dst) && !file_exists("{$dst}/custom")) {
+                @symlink('/var/lib/asterisk/sounds/custom', "{$dst}/custom");
+            }
         }
         if (!file_exists('/usr/share/asterisk/sounds/custom')) {
             @symlink('/var/lib/asterisk/sounds/custom', '/usr/share/asterisk/sounds/custom');