[web] [desktop] Enable Polish translations (#2459)

A big hats off to the person who did 0-99% 🇵🇱 over the weekend!

desktop/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## v1.7.3 (Unreleased)
 
+-   Support Polish translations.
 -   .
 
 ## v1.7.2

web/apps/photos/src/components/Sidebar/Preferences.tsx

@@ -167,5 +167,7 @@ const localeName = (locale: SupportedLocale) => {
             return "Brazilian Portuguese";
         case "ru-RU":
             return "Russian";
+        case "pl-PL":
+            return "Polish";
     }
 };

web/packages/next/i18n.ts

@@ -28,6 +28,7 @@ export const supportedLocales = [
     "es-ES" /* Spanish */,
     "pt-BR" /* Portuguese, Brazilian */,
     "ru-RU" /* Russian */,
+    "pl-PL" /* Polish */,
 ] as const;
 
 /** The type of {@link supportedLocales}. */
@@ -224,6 +225,8 @@ const closestSupportedLocale = (
             return "pt-BR";
         } else if (ls.startsWith("ru")) {
             return "ru-RU";
+        } else if (ls.startsWith("pl")) {
+            return "pl-PL";
         }
     }