Serve 503 when PocketBase is unavailable across all content pages

Elternbeirat.Web/Shared/Cultures.cs

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+using System.Globalization;
+
+namespace Elternbeirat.Web.Shared;
+
+/// <summary>
+///     Shared <see cref="CultureInfo"/> instances used to format visitor-facing
+///     text.
+/// </summary>
+/// <remarks>
+///     Kept in one place so every component renders month and weekday names the
+///     same way, rather than each holding its own <c>de-DE</c> lookup. This is only
+///     for display text; machine-readable output (e.g. an HTML <c>datetime</c>
+///     attribute) uses <see cref="CultureInfo.InvariantCulture"/> instead.
+/// </remarks>
+internal static class Cultures
+{
+    /// <summary>
+    ///     German culture, for the month and weekday names visitors read.
+    /// </summary>
+    public static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
+}