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EnvelopeGenerator/EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Layout/LanguageControls.razor
TekH 735f072dd1 Add localization support for multi-language UI
This commit introduces comprehensive localization support for the application, enabling dynamic language switching and localized UI elements. Key changes include:

- Added `.resx` files for German (de-DE), English (en-US), and French (fr-FR).
- Updated Razor components to use `IStringLocalizer` for dynamic string localization.
- Introduced the `L(string key, string fallback)` helper method for consistent localized string retrieval with fallback support.
- Implemented dynamic culture initialization in `Program.cs` via an API call to `/api/Localization/lang`.
- Localized error pages, grid columns, tabs, popups, validation messages, and tooltips.
- Dynamically generated privacy policy links based on the current culture.
- Improved user experience with fully localized loading states, error handling, and UI labels.

These changes enhance accessibility and usability, making the application more user-friendly for a global audience.
2026-09-28 10:46:06 +02:00

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@using EnvelopeGenerator.Server.Client.Services
@using EnvelopeGenerator.Application.Resources
@using Microsoft.Extensions.Localization
@rendermode InteractiveWebAssembly
@inject LocalizationService LocalizationService
@inject NavigationManager Navigation
@inject IStringLocalizer<Resource> UiLocalizer
<div class="sf-lang-combo">
<button type="button"
class="sf-lang-trigger"
@onclick="ToggleMenu"
aria-label="@L("Language", "Language")"
aria-expanded="@_isOpen">
<span class="fi @_selected.FlagClass"></span>
</button>
@if (_isOpen)
{
<button type="button"
class="sf-lang-backdrop"
aria-label="@L("CloseLanguageMenu", "Close language menu")"
@onclick="CloseMenu">
</button>
<div class="sf-lang-menu" role="listbox" aria-label="@L("Languages", "Languages")">
@foreach (var option in _options)
{
<button type="button"
class="sf-lang-option @(_selected.Code == option.Code ? "sf-lang-option--active" : string.Empty)"
role="option"
aria-selected="@(_selected.Code == option.Code)"
@onmousedown:preventDefault="true"
@onclick="() => SelectLanguageAsync(option)">
<span class="fi @option.FlagClass"></span>
<span>@option.ShortName</span>
</button>
}
</div>
}
</div>
@code {
private readonly IReadOnlyList<LanguageOption> _options =
[
new("de-DE", "fi-de", "DE"),
new("en-US", "fi-us", "EN"),
new("fr-FR", "fi-fr", "FR")
];
private LanguageOption _selected = new("de-DE", "fi-de", "DE");
private bool _isOpen;
protected override async Task OnInitializedAsync()
{
var currentLanguage = await LocalizationService.GetLanguageAsync();
_selected = _options.FirstOrDefault(x => x.Code.Equals(currentLanguage, StringComparison.OrdinalIgnoreCase))
?? _options[0];
}
private void ToggleMenu()
{
_isOpen = !_isOpen;
}
private void CloseMenu()
{
_isOpen = false;
}
private async Task SelectLanguageAsync(LanguageOption option)
{
if (_selected.Code.Equals(option.Code, StringComparison.OrdinalIgnoreCase))
{
_isOpen = false;
return;
}
_selected = option;
_isOpen = false;
await LocalizationService.SetLanguageAsync(option.Code);
Navigation.NavigateTo(Navigation.Uri, forceLoad: true);
}
private sealed record LanguageOption(string Code, string FlagClass, string ShortName);
string L(string key, string fallback)
{
var value = UiLocalizer[key];
return value.ResourceNotFound ? fallback : value.Value;
}
}