admin: Improve file readability

admin/static/js/common.js

@@ -200,6 +200,18 @@ angular.module("FICApp")
 	    else
 		return "";
 	}
+    })
+
+    .filter("bto16", function() {
+        return function(input) {
+          const raw = atob(input);
+          let result = '';
+          for (let i = 0; i < raw.length; i++) {
+            const hex = raw.charCodeAt(i).toString(16);
+            result += (hex.length === 2 ? hex : '0' + hex);
+          }
+          return result;
+	}
     });
 
 angular.module("FICApp")