ExplanatoryDictionary_v2

using System;
using System.Collections.Generic;
using System.Text;

class Program
{
    public static void Main()
    {
        Work();
    }

    private static void Work()
    {
        Console.Clear();
        Console.OutputEncoding = Encoding.UTF8;
        Console.Title = GetText("Title");

        Dictionary<string, string> dictionary = CreateDictionary();

        PrintHeader();

        bool isRunning = true;

        while (isRunning == true)
        {
            string input = RequestInput();

            if (IsExitCommand(input) == true)
            {
                ShowInfo(GetText("ProgramEnded"));
                isRunning = false;
            }
            else
            {
                ProcessQuery(dictionary, input);
            }
        }
    }

    private static Dictionary<string, string> CreateDictionary()
    {
        Dictionary<string, string> dictionary = new Dictionary<string, string>();

        dictionary.Add("apple", "яблоко");
        dictionary.Add("book", "книга");
        dictionary.Add("car", "машина");
        dictionary.Add("house", "дом");
        dictionary.Add("computer", "компьютер");

        return dictionary;
    }

    private static string RequestInput()
    {
        string? input;
        bool isValid;

        do
        {
            Console.Write(GetText("InputPrompt"));
            input = Console.ReadLine();

            isValid = !string.IsNullOrWhiteSpace(input);

            if (isValid == false)
            {
                ShowWarning(GetText("EmptyInput"));
                Console.WriteLine();
            }

        } while (isValid == false);

        return input!.Trim();
    }

    private static void ProcessQuery(Dictionary<string, string> dictionary, string input)
    {
        bool found = TryFindTranslation(dictionary, input, out string result);

        if (found == true)
        {
            ShowSuccess(result);
        }
        else
        {
            string message = string.Format(GetText("WordNotFound"), input);
            ShowError(message);
        }

        Console.WriteLine();
    }

    private static bool TryFindTranslation(
        Dictionary<string, string> dictionary,
        string input,
        out string result)
    {
        string normalized = input.ToLower();

        bool foundByKey = dictionary.TryGetValue(normalized, out string russianWord);

        if (foundByKey == true)
        {
            result = input + " → " + russianWord;
            return true;
        }

        foreach (KeyValuePair<string, string> pair in dictionary)
        {
            bool equals = string.Equals(pair.Value, input, StringComparison.OrdinalIgnoreCase);

            if (equals == true)
            {
                result = input + " → " + pair.Key;
                return true;
            }
        }

        result = string.Empty;
        return false;
    }

    private static bool IsExitCommand(string input)
    {
        string normalized = input.ToLower();

        bool isExitEng = normalized == "exit";
        bool isExitRus = normalized == "выход";

        return isExitEng || isExitRus;
    }

    private static void PrintHeader()
    {
        ShowHeader(GetText("Border"));
        ShowHeader(GetText("Header"));
        ShowHeader(GetText("Border"));
        Console.WriteLine();
    }

    private static void Display(string message, ConsoleColor color)
    {
        Console.ForegroundColor = color;
        Console.WriteLine(message);
        Console.ResetColor();
    }

    private static void ShowHeader(string message)
    {
        Display(message, ConsoleColor.Cyan);
    }

    private static void ShowSuccess(string message)
    {
        Display("✔ " + message, ConsoleColor.Green);
    }

    private static void ShowError(string message)
    {
        Display("✘ " + message, ConsoleColor.Red);
    }

    private static void ShowWarning(string message)
    {
        Display("! " + message, ConsoleColor.Yellow);
    }

    private static void ShowInfo(string message)
    {
        Display(message, ConsoleColor.Cyan);
    }

    private static string GetText(string key)
    {
        if (key == "Title")
            return "ENG ⇄ RUS Dictionary";

        if (key == "InputPrompt")
            return "Введите слово (или 'exit'/'выход' для выхода): ";

        if (key == "EmptyInput")
            return "Пустой ввод. Попробуйте снова.";

        if (key == "WordNotFound")
            return "Слово \"{0}\" не найдено в словаре.";

        if (key == "ProgramEnded")
            return "Программа завершена.";

        if (key == "Border")
            return "======================================";

        if (key == "Header")
            return "        ENG ⇄ RUS Dictionary          ";

        return string.Empty;
    }
}