Add usage of i18n for plugins manager (#61)

src/components/dialogs/searchDialog/PluginsManager.vue

@@ -5,7 +5,7 @@
     scrollable
   >
     <v-card>
-      <v-card-title> <v-icon>mdi-toy-brick</v-icon> Plugins manager </v-card-title>
+      <v-card-title> <v-icon>mdi-toy-brick</v-icon> {{ $t("plugin_manager") }} </v-card-title>
       <v-card-text>
         <v-switch
           v-for="(plugin, key) in searchEngineState.searchPlugins"

src/components/dialogs/searchDialog/SearchDialog.vue

@@ -50,7 +50,7 @@
         </v-card-text>
         <v-card-actions>
           <v-btn @click="openPluginManager">
-            <v-icon>mdi-cog</v-icon>  Plugins manager
+            <v-icon>mdi-cog</v-icon> {{ $t("plugin_manager") }}
           </v-btn>
         </v-card-actions>
       </v-card>

src/locale/en.ts

@@ -64,6 +64,7 @@ export default {
   action: 'Action |||| Actions',
   search_engine: 'Search engine',
   usage: 'usage',
+  plugin_manager: 'Plugin manager',
 
   title: {
     _: 'Title',