get name of Solarized Dark using i18n

src/_locales/en/messages.json

@@ -596,6 +596,10 @@
     "message": "Light",
     "description": "Light color"
   },
+  "solarizedDark": {
+    "message": "Solarized Dark",
+    "description": "Solarized Dark color scheme"
+  },
   "exportVault": {
     "message": "Export Vault"
   },

src/popup/settings/options.component.ts

@@ -43,7 +43,7 @@ export class OptionsComponent implements OnInit {
             { name: i18nService.t('light'), value: 'light' },
             { name: i18nService.t('dark'), value: 'dark' },
             { name: 'Nord', value: 'nord' },
-            { name: 'Solarized Dark', value: 'solarizedDark' },
+            { name: i18nService.t('solarizedDark'), value: 'solarizedDark' },
         ];
         this.uriMatchOptions = [
             { name: i18nService.t('baseDomain'), value: UriMatchType.Domain },