Refactor everything

internal/lang/lang/en.json

@@ -0,0 +1,35 @@
+{
+  "lang": "en-UK",
+
+  "title.today": "Your day so far",
+  "title.days": "Previous days",
+  "title.notes": "Notes",
+  "title.info": "Info",
+
+  "link.today": "today",
+  "link.tomorrow": "tomorrow",
+  "link.days": "previous days",
+  "link.notes": "notes",
+  "link.info": "app information",
+
+  "time.date": "Today is",
+  "time.grace": "grace period active",
+  "button.save": "Save",
+  "button.notes": "New note",
+  "prompt.notes": "Note name",
+  "noscript.notes": "/notes/<name>",
+  "prompt.days": "To the bottom",
+
+  "info.version": "Version",
+  "info.version.link": "source and changelog",
+  "info.export": "Export data",
+  "info.readme": "Edit readme.txt",
+  "info.config": "Edit config",
+
+  "info.telegram.auth_fail": "Failed auth attempt in Hibiscus.txt",
+  "info.telegram.scram": "Hibiscus SCRAM triggered, shutting down",
+
+  "error.404": "The page you were looking for doesn't exist",
+  "error.500": "It's probably not your fault, but something broke",
+  "error.prompt": "Go home?"
+}

internal/lang/lang/ru.json

@@ -0,0 +1,35 @@
+{
+  "lang": "ru",
+
+  "title.today": "Сегодняшний день",
+  "title.days": "Предыдущие дни",
+  "title.notes": "Заметки",
+  "title.info": "Информация",
+
+  "link.today": "сегодня",
+  "link.tomorrow": "завтра",
+  "link.days": "раньше",
+  "link.notes": "заметки",
+  "link.info": "системная информация",
+
+  "time.date": "Сегодня",
+  "time.grace": "редактируется вчерашний день",
+  "button.save": "Сохранить",
+  "button.notes": "Новая заметка",
+  "prompt.notes": "Название заметки",
+  "noscript.notes": "/notes/<название>",
+  "prompt.days": "Вниз",
+
+  "info.version": "Версия",
+  "info.version.link": "исходный код",
+  "info.export": "Экспорт данных",
+  "info.readme": "Редактировать readme.txt",
+  "info.config": "Редактировать конфиг",
+
+  "info.telegram_notification": "Неверная попытка авторизации в Hibiscus.txt",
+  "info.telegram.scram": "Активирована функция SCRAM в Hibiscus.txt, сервер выключается",
+
+  "error.404": "Страница, которую вы ищете, не существует",
+  "error.500": "Что-то сломалось",
+  "error.prompt": "На главную?"
+}

internal/lang/main.go

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+package lang
+
+import (
+	"embed"
+	"encoding/json"
+	"log/slog"
+)
+
+//go:embed lang
+var lang embed.FS
+var translations = map[string]string{}
+
+// SetLanguage loads a json file for selected language into the Translations map, with English language as a fallback.
+func SetLanguage(language string) error {
+	loadLanguage := func(language string) error {
+		filename := "lang/" + language + ".json"
+		fileContents, err := lang.ReadFile(filename)
+		if err != nil {
+			slog.Error("error reading language file",
+				"error", err,
+				"file", filename)
+			return err
+		}
+		return json.Unmarshal(fileContents, &translations)
+	}
+	translations = map[string]string{} // Clear the map to avoid previous language remaining
+	err := loadLanguage("en")          // Load English as fallback
+	if err != nil {
+		return err
+	}
+	return loadLanguage(language)
+}
+
+// Translate attempts to match an id to a string in current language.
+func Translate(id string) string {
+	if v, ok := translations[id]; !ok {
+		return id
+	} else {
+		return v
+	}
+}