feat(initializing): Add description and back button to server type step

assets/translations/en.json

@@ -273,6 +273,8 @@
         "place_where_data": "A place where your data and SelfPrivacy services will reside:",
         "how": "How to obtain API token",
         "provider_bad_key_error": "Provider API key is invalid",
+        "choose_location_type": "Choose your server location and type:",
+        "back_to_locations": "Go back to available locations!",
         "no_locations_found": "No available locations found. Make sure your account is accessible.",
         "no_server_types_found": "No available server types found. Make sure your account is accessible and try to change your server location.",
         "cloudflare_bad_key_error": "Cloudflare API key is invalid",

assets/translations/ru.json

@@ -271,7 +271,9 @@
         "connect_to_server": "Подключите сервер",
         "place_where_data": "Здесь будут жить ваши данные и SelfPrivacy-сервисы:",
         "how": "Как получить API Token",
-        "provider_bad_key_error": "API ключ провайдера неверен",
+        "provider_bad_key_error": "Provider API key is invalid",
+        "choose_location_type": "Выберите локацию и тип вашего сервера:",
+        "back_to_locations": "Назад к доступным локациям!",
         "no_locations_found": "Не найдено локаций. Убедитесь, что ваш аккаунт доступен.",
         "no_server_types_found": "Не удалось получить список серверов. Убедитесь, что ваш аккаунт доступен и попытайтесь сменить локацию сервера.",
         "cloudflare_bad_key_error": "Cloudflare API ключ неверен",

lib/ui/pages/setup/initializing/initializing.dart

@@ -82,6 +82,11 @@ class InitializingPage extends StatelessWidget {
                             activeIndex: cubit.state.porgressBar,
                           ),
                   ),
+                  if (cubit.state.porgressBar ==
+                      ServerSetupProgress.serverProviderFilled.index)
+                    BrandText.h2(
+                      'initializing.choose_location_type'.tr(),
+                    ),
                   _addCard(
                     AnimatedSwitcher(
                       duration: const Duration(milliseconds: 300),

lib/ui/pages/setup/initializing/server_type_picker.dart

@@ -4,6 +4,7 @@ import 'package:selfprivacy/config/brand_theme.dart';
 import 'package:selfprivacy/logic/cubit/app_config_dependent/authentication_dependend_cubit.dart';
 import 'package:selfprivacy/logic/models/server_provider_location.dart';
 import 'package:selfprivacy/logic/models/server_type.dart';
+import 'package:selfprivacy/ui/components/brand_button/brand_button.dart';
 
 class ServerTypePicker extends StatefulWidget {
   const ServerTypePicker({
@@ -21,7 +22,7 @@ class _ServerTypePickerState extends State<ServerTypePicker> {
   ServerProviderLocation? serverProviderLocation;
   ServerType? serverType;
 
-  void setServerProviderLocation(final ServerProviderLocation location) {
+  void setServerProviderLocation(final ServerProviderLocation? location) {
     setState(() {
       serverProviderLocation = location;
     });
@@ -39,6 +40,9 @@ class _ServerTypePickerState extends State<ServerTypePicker> {
     return SelectTypePage(
       location: serverProviderLocation!,
       serverInstallationCubit: widget.serverInstallationCubit,
+      backToLocationPickingCallback: () {
+        setServerProviderLocation(null);
+      },
     );
   }
 }
@@ -102,6 +106,7 @@ class SelectLocationPage extends StatelessWidget {
 
 class SelectTypePage extends StatelessWidget {
   const SelectTypePage({
+    required this.backToLocationPickingCallback,
     required this.location,
     required this.serverInstallationCubit,
     super.key,
@@ -109,6 +114,7 @@ class SelectTypePage extends StatelessWidget {
 
   final ServerProviderLocation location;
   final ServerInstallationCubit serverInstallationCubit;
+  final Function backToLocationPickingCallback;
 
   @override
   Widget build(final BuildContext context) => FutureBuilder(
@@ -119,7 +125,20 @@ class SelectTypePage extends StatelessWidget {
         ) {
           if (snapshot.hasData) {
             if ((snapshot.data as List<ServerType>).isEmpty) {
-              return Text('initializing.no_server_types_found'.tr());
+              return Column(
+                children: [
+                  Text(
+                    'initializing.no_server_types_found'.tr(),
+                  ),
+                  const SizedBox(height: 10),
+                  BrandButton.rised(
+                    onPressed: () {
+                      backToLocationPickingCallback();
+                    },
+                    text: 'initializing.back_to_locations'.tr(),
+                  ),
+                ],
+              );
             }
             return ListView(
               padding: paddingH15V0,