More localization (#403)

* Translate toolbox tab headers

* Use plural form in recipe organizer header

frontend/src/pages/Admin/ToolBox/RecipeOrganizer.vue

@@ -4,7 +4,7 @@
       <v-btn-toggle v-model="filter" mandatory color="primary">
         <v-btn small value="category">
           <v-icon>mdi-tag-multiple</v-icon>
-          {{ $t("category.category") }}
+          {{ $t("recipe.categories") }}
         </v-btn>
 
         <v-btn small value="tag">

frontend/src/pages/Admin/ToolBox/index.vue

@@ -5,7 +5,7 @@
         <v-tabs-slider></v-tabs-slider>
 
         <v-tab href="#event-notifications">
-          Notify
+          {{$t('settings.notify')}}
           <v-icon>mdi-bell-alert</v-icon>
         </v-tab>
         <v-tab href="#category-editor">
@@ -18,7 +18,7 @@
           <v-icon>mdi-tag-multiple-outline</v-icon>
         </v-tab>
         <v-tab href="#organize">
-          Organize
+          {{$t('settings.organize')}}
           <v-icon>mdi-broom</v-icon>
         </v-tab>
       </v-tabs>