cleanup and added unit tests

hartmann-foto-documentation-frontend/lib/pages/ui_utils/component/general_submit_widget.dart

@@ -1,32 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:fotodocumentation/l10n/app_localizations.dart';
-import 'package:fotodocumentation/pages/ui_utils/general_style.dart';
-import 'package:fotodocumentation/utils/di_container.dart';
-
-typedef SubmitCallback = void Function();
-
-class GeneralSubmitWidget extends StatelessWidget {
-  GeneralStyle get _generalStyle => DiContainer.get();
-  
-  final SubmitCallback onSelect;
-  final String? title;
-
-  const GeneralSubmitWidget({super.key, required this.onSelect, this.title});
-
-  @override
-  Widget build(BuildContext context) {
-    String text = title ?? AppLocalizations.of(context)!.submitWidget;
-    return Row(
-      mainAxisAlignment: MainAxisAlignment.end,
-      crossAxisAlignment: CrossAxisAlignment.end,
-      children: [
-        ElevatedButton(
-          key: Key("SubmitWidgetButton"),
-          style: _generalStyle.elevatedButtonStyle,
-          onPressed: onSelect,
-          child: Text(text),
-        ),
-      ],
-    );
-  }
-}