Refactor localization system and migrate to Fyne's built-in support

Replaced the `i18n` and `toml` dependencies with Fyne's built-in language system for localization management. Updated the `Localizer` implementation to handle translations using JSON files and embed functionality. Simplified language selection and persisted settings via Fyne's preferences API.

kernel/translations/base.ru.json

@@ -0,0 +1,45 @@
+{
+  "Advanced": "Расширенные",
+  "Cancel": "Отмена",
+  "Confirm": "Подтвердить",
+  "Copy": "Копировать",
+  "Create Folder": "Создать папку",
+  "Cut": "Вырезать",
+  "Enter filename": "Введите имя файла",
+  "Error": "Ошибка",
+  "Favourites": "Избранное",
+  "File": "Файл",
+  "Folder": "Папка",
+  "New Folder": "Новая папка",
+  "No": "Нет",
+  "OK": "ОК",
+  "Open": "Открыть",
+  "Paste": "Вставить",
+  "Quit": "Выйти",
+  "Redo": "Повторить",
+  "Save": "Сохранить",
+  "Select all": "Выбрать всё",
+  "Show Hidden Files": "Показать скрытые файлы",
+  "Undo": "Отменить",
+  "Yes": "Да",
+  "file.name": {
+    "other": "Имя"
+  },
+  "file.parent": {
+    "other": "Вверх"
+  },
+  "friday": "Пятница",
+  "friday.short": "Пт",
+  "monday": "Понедельник",
+  "monday.short": "Пн",
+  "saturday": "Суббота",
+  "saturday.short": "Сб",
+  "sunday": "Воскресенье",
+  "sunday.short": "Вс",
+  "thursday": "Вторник",
+  "thursday.short": "Вт",
+  "tuesday": "Четверг",
+  "tuesday.short": "Чт",
+  "wednesday": "Среда",
+  "wednesday.short": "Ср"
+}