Fix query string handling to work with special characters

aleksis/core/assets/components/LegacyBaseTemplate.vue

@@ -27,11 +27,11 @@ export default {
   },
   computed: {
     queryString() {
-      let qs = "";
-      for (let queryObject in this.$route.query) {
-        qs += `${qs === "" ? "?" : "&"}${queryObject}=${this.$route.query[queryObject]}`;
+      let qs = [];
+      for (const { param, value } of this.$route.query) {
+        qs.push(`${param}=${encodeURIComponent(value)}`);
       };
-      return qs
+      return "?" + qs.join("&");
     },
   },
   methods: {