More localization (#358)

* Translate missing items on About page

* Localize import summary dialog

* Make site menu translation reactive

* Localize import options

* Include semi colon in string

* Move API texts to frontend + better status codes

* Provide feedback to user when no meal is planned

* Fix API tests after latest rework

* Add warning for API changes in changelog

* Refactor API texts handling

* Refactor API texts handling #2

* Better API feedback

* Rearrange strings hierarchy

* Add messages upon recipe updated

* Fix 'recipe effected' typo

* Remove snackbar usage in backend

* Translate toolbox

* Provide feedback for tags CRUD

* Fix messed up merge

* Translate sign-up form

* Better feedback for sign-up CRUD

* Refactor log-in API texts handling

* No error message when user is not authenticated

* Remove unimportant console log

frontend/src/components/UI/TheSiteMenu.vue

@@ -44,9 +44,9 @@ export default {
   components: {
     LoginDialog,
   },
-  data: function() {
-    return {
-      items: [
+  computed: {
+    items() {
+      return [
         {
           icon: "mdi-account",
           title: "Login",
@@ -83,10 +83,8 @@ export default {
           nav: "/admin",
           restricted: true,
         },
-      ],
-    };
-  },
-  computed: {
+      ]
+    },
     filteredItems() {
       if (this.loggedIn) {
         return this.items.filter(x => x.restricted == true);