[Shortcut Guide] Core UI remains English when PowerToys language is German

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## Microsoft PowerToys version

0.101.2312.0

## Utility with translation issue

Shortcut Guide

## Language affected

German (`de-DE`)

## Steps to reproduce

1. Change the PowerToys language to German.
2. Fully restart PowerToys so the selected language is applied to newly launched utility processes.
3. Open PowerToys Settings > Shortcut Guide.
4. Open the Shortcut Guide overlay.
5. Enter a search with no matches.
6. Open a shortcut row's context menu.

PowerToys Settings itself opens in German, confirming that the selected language was applied.

## Actual phrases

Several Shortcut Guide Settings strings remain English, including:

- `Hold Windows key`
- the Windows-key action description
- `Open Shortcut Guide`

The Shortcut Guide overlay also remains English for core product chrome, including:

- `Shortcut Guide`
- `Search shortcuts`
- `Close`
- `Settings`
- `Pinned shortcuts`
- `Recommended shortcuts`
- `Pin`
- `No results found`

This report does not include application-manifest names or descriptions, which are allowed to remain English under the current manifest limitation.

## Expected phrases

The core Shortcut Guide Settings labels and overlay chrome should use their German-localized equivalents when PowerToys is configured for German.

## Why the current behavior is wrong

The PowerToys Settings window title and navigation switch to German after restart, while Shortcut Guide-specific Settings text and the overlay remain English. This is an unintended English fallback in the utility, not a machine-wide language-selection failure.

## Possible implementation clue

`src/modules/ShortcutGuide/ShortcutGuide.Ui/ShortcutGuideXAML/App.xaml.cs` initializes the WinUI application without applying `LanguageHelper.LoadLanguage()` through `ApplicationLanguages.PrimaryLanguageOverride`, a pattern used by other PowerToys WinUI utilities.

Read src/modules/ShortcutGuide/ShortcutGuide.Ui/ShortcutGuideXAML/App.xaml.cs and compare its initialization with the LanguageHelper.LoadLanguage() pattern used by other PowerToys WinUI utilities. After applying the language override, verify that restarting PowerToys in German localizes the listed Shortcut Guide Settings labels and overlay chrome.

Written by the indexing model from the issue text.