Rearrange assets.

js/Mixin.Attribution.js

@@ -0,0 +1,19 @@
+/**
+ * Attribution handling.
+ */
+L.Control.Attribution.addInitHook(function() {
+    this.options.prefix += L.Contao.ATTRIBUTION;
+});
+
+L.Control.Attribution.include({
+    setPrefix: function (prefix) {
+        if (prefix.indexOf(L.Contao.ATTRIBUTION) === -1) {
+            prefix += L.Contao.ATTRIBUTION;
+        }
+
+        this.options.prefix = prefix;
+
+        this._update();
+        return this;
+    }
+});