web: update some locale details (#8090)

This commit adds "Polish" and "Korean" to the list of languages recognized by the
web-UI, and updates the XLIFF files to include a few new strings from the RAC
project.

web/src/locale-codes.ts

@@ -15,10 +15,13 @@ export const targetLocales = [
   `en`,
   `es`,
   `fr`,
+  `ko`,
+  `nl`,
   `pl`,
   `pseudo-LOCALE`,
   `tr`,
   `zh_TW`,
+  `zh-CN`,
   `zh-Hans`,
   `zh-Hant`,
 ] as const;
@@ -32,10 +35,13 @@ export const allLocales = [
   `en`,
   `es`,
   `fr`,
+  `ko`,
+  `nl`,
   `pl`,
   `pseudo-LOCALE`,
   `tr`,
   `zh_TW`,
+  `zh-CN`,
   `zh-Hans`,
   `zh-Hant`,
 ] as const;