Center loading

src/components/DictionaryView.vue

@@ -403,6 +403,10 @@ div.welcome article {
   padding-bottom: 10px;
 }
 
+#spinner {
+  margin: auto;
+}
+
 #search_results, #spinner, #single_article_container, div.welcome, div.search_container, .error {
   padding-left: calc((100vw - 1000px) / 2);
   padding-right: calc((100vw - 1000px) / 2);