From 710638c85b6ede4a113a404abc84e154fa870457 Mon Sep 17 00:00:00 2001
From: Vladyslav Prykhodko <vlad.pryhodko@icloud.com>
Date: Wed, 20 Nov 2024 00:16:10 +0200
Subject: [PATCH] UI: Update document 'lang' attribute based on user language
 preference

---
 ui-ngx/src/app/core/settings/settings.effects.ts | 8 +++++---
 ui-ngx/src/app/core/settings/settings.utils.ts   | 3 ++-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/ui-ngx/src/app/core/settings/settings.effects.ts b/ui-ngx/src/app/core/settings/settings.effects.ts
index 1564814a74..3ce59f9f6e 100644
--- a/ui-ngx/src/app/core/settings/settings.effects.ts
+++ b/ui-ngx/src/app/core/settings/settings.effects.ts
@@ -15,7 +15,7 @@
 ///
 
 import { ActivationEnd, Router } from '@angular/router';
-import { Injectable } from '@angular/core';
+import { Inject, Injectable } from '@angular/core';
 import { select, Store } from '@ngrx/store';
 import { Actions, createEffect, ofType } from '@ngrx/effects';
 import { TranslateService } from '@ngx-translate/core';
@@ -31,6 +31,7 @@ import { updateUserLang } from '@app/core/settings/settings.utils';
 import { UtilsService } from '@core/services/utils.service';
 import { getCurrentAuthUser } from '@core/auth/auth.selectors';
 import { ActionAuthUpdateLastPublicDashboardId } from '../auth/auth.actions';
+import { DOCUMENT } from '@angular/common';
 
 export const SETTINGS_KEY = 'SETTINGS';
 
@@ -43,7 +44,8 @@ export class SettingsEffects {
     private router: Router,
     private localStorageService: LocalStorageService,
     private titleService: TitleService,
-    private translate: TranslateService
+    private translate: TranslateService,
+    @Inject(DOCUMENT) private document: Document,
   ) {
   }
 
@@ -56,7 +58,7 @@ export class SettingsEffects {
     distinctUntilChanged((a, b) => a?.userLang === b?.userLang),
     tap(setting => {
       this.localStorageService.setItem(SETTINGS_KEY, setting);
-      updateUserLang(this.translate, setting.userLang);
+      updateUserLang(this.translate, this.document, setting.userLang);
     })
   ), {dispatch: false});
 
diff --git a/ui-ngx/src/app/core/settings/settings.utils.ts b/ui-ngx/src/app/core/settings/settings.utils.ts
index 8f0a261d08..fa7ede8559 100644
--- a/ui-ngx/src/app/core/settings/settings.utils.ts
+++ b/ui-ngx/src/app/core/settings/settings.utils.ts
@@ -19,7 +19,7 @@ import { TranslateService } from '@ngx-translate/core';
 import _moment from 'moment';
 import { Observable } from 'rxjs';
 
-export function updateUserLang(translate: TranslateService, userLang: string, translations = env.supportedLangs): Observable<any> {
+export function updateUserLang(translate: TranslateService, document: Document, userLang: string, translations = env.supportedLangs): Observable<any> {
   let targetLang = userLang;
   if (!translations) {
     translations = env.supportedLangs;
@@ -37,6 +37,7 @@ export function updateUserLang(translate: TranslateService, userLang: string, tr
   if (!env.production) {
     console.log(`Detected supported lang: ${detectedSupportedLang}`);
   }
+  document.documentElement.lang = detectedSupportedLang.replace('_', '-');
   _moment.locale([detectedSupportedLang]);
   return translate.use(detectedSupportedLang);
 }