feat: added l10n for Deutsch

[AsCress]

Adds localizations for Deutsch to the app.
⚠️ ALL THESE ARE AUTOMATICALLY GENERATED USING A MACHINE TRANSLATOR, as I don't know Deutsch (a bit maybe, but not that much 😅).

@marcnause You are the only one who can review these changes here I guess 😂. You can have a look at the app_de.arb file.

Summary by Sourcery

Add German translations and enable German locale support in the app

New Features:

• Include app_localizations_de.dart with German translations
• Register German locale in supportedLocales and localization delegate

[sourcery-ai]

Reviewer's Guide

This PR integrates German (de) as a supported locale by updating the localization delegate and supported locales list, and includes a new, machine-translated AppLocalizationsDe implementation along with an ARB file stub for German strings.

Class diagram for new German localization support

classDiagram
    class AppLocalizations {
        <<abstract>>
        +String locale
        +oscilloscope
        +multimeter
        +logicAnalyzer
        ...
    }
    class AppLocalizationsDe {
        +AppLocalizationsDe([String locale = 'de'])
        +oscilloscope
        +multimeter
        +logicAnalyzer
        ...
    }
    class AppLocalizationsEn {
        +AppLocalizationsEn([String locale = 'en'])
        +oscilloscope
        +multimeter
        +logicAnalyzer
        ...
    }
    AppLocalizationsDe --|> AppLocalizations
    AppLocalizationsEn --|> AppLocalizations

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Class diagram for localization delegate changes

classDiagram
    class _AppLocalizationsDelegate {
        +isSupported(Locale locale)
        +shouldReload(_AppLocalizationsDelegate old)
    }
    class AppLocalizations {
        +supportedLocales : List<Locale>
    }
    _AppLocalizationsDelegate ..> AppLocalizations : uses
    AppLocalizations : supportedLocales = [Locale('de'), Locale('en')]
    _AppLocalizationsDelegate : isSupported now supports 'de' and 'en'

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File-Level Changes

Change	Details	Files
Extend localization support to German	Imported AppLocalizationsDe in the main localization file Added Locale('de') to supportedLocales Updated isSupported to include 'de' Extended lookupAppLocalizations to return AppLocalizationsDe() for 'de'	lib/l10n/app_localizations.dart
Add autogenerated German translations	Introduced a new AppLocalizationsDe class with overrides for all string getters Populated ~1000 lines of German translations via machine translation	lib/l10n/app_localizations_de.dart
Add German ARB file placeholder	Created an empty app_de.arb file as a basis for future ARB-driven translations	lib/l10n/app_de.arb

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[sourcery-ai]

Hey @AsCress - I've reviewed your changes and they look great!

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[AsCress]

@marcnause In all places wherever there is MIC, it is getting translated to MIKROFON. Do we have a short form for MIKROFON in German, as introducing such a long name for channels, distorts UI in some places.

[AsCress]

Discussed in meet, defaulting to MIC.

[marcnause]

Seems like I was too much in "English mode" during the meet to remember that "Mikro" is used as a short form of "Mikrofon" in German. Not sure if is short enough to fit the UI. If not, we should indeed default to MIC.

[github-actions]

Build successful. APKs to test: https://github.com/fossasia/pslab-android/actions/runs/16236569345/artifacts/3518422375