Calendar: Inline-Mode + i18n - Changing the locale does not update the calendar corretcly

[cw-tom]

Describe the bug

Given:
Calendar-Component in inline mode:
<p-calendar [inline]="true"/>

A service to change the language / locale within the running app by using ngx-translate:
this.translateService.use(locale);
this.translateService.get('primeng').subscribe((res) => { this.config.setTranslation(res); });

Before changing the locale
According to the translation, we have:
firstDayOfWeek = 0

The calendar is as follows:

Problem after changing the locale:
According to the translation we have the following after changing the locale to german:
firstDayOfWeek = 1

The day-labels are correctly translated. However, the the date-cells of the calendar do not fit to the weekday. As shown within the screenshot, August 16th should not be a Saturday:

Current workaround:
Invoke updateUI() within the calendar when changing the locale:
this.primeNgConfig.translationObserver.subscribe(() => { this.calendar?.updateUI(); })

Environment

Windows 10, Firefox, ng serve

Reproducer

No response

Angular version

18.1.4

PrimeNG version

17.18.8

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

20.16.0

Browser(s)

Firefox

Steps to reproduce the behavior

1. Create a calendar in inline-mode.
2. Change the locale / language using ngx-translate and provide a different firstDayOfWeek within the translations.

Expected behavior

The dates within the date-cells of the calendar should match the weekday.

[github-actions]

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