Repository: microsoft/PowerToys
File: src/modules/poweraccent/PowerAccent.Core/Languages.cs (C#)

Code before:

        // Hebrew
        private static string[] GetDefaultLetterKeyHE(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_MINUS => new string[] { "־", "–" },
                _ => Array.Empty<string>(),
            };
        }

        // Hungarian
        private static string[] GetDefaultLetterKeyHU(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new string[] { "á" },
                LetterKey.VK_E => new string[] { "é" },
                LetterKey.VK_I => new string[] { "í" },
                LetterKey.VK_O => new string[] { "ó", "ő", "ö" },
                LetterKey.VK_U => new string[] { "ú", "ű", "ü" },
                _ => Array.Empty<string>(),
            };
        }

        // Romanian
        private static string[] GetDefaultLetterKeyRO(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new string[] { "ă", "â" },
                LetterKey.VK_I => new string[] { "î" },
                LetterKey.VK_S => new string[] { "ș" },
                LetterKey.VK_T => new string[] { "ț" },
                _ => Array.Empty<string>(),
            };
        }

        // Italian
        private static string[] GetDefaultLetterKeyIT(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new string[] { "à" },
                LetterKey.VK_E => new string[] { "è", "é", "€" },
                LetterKey.VK_I => new string[] { "ì", "í" },
                LetterKey.VK_O => new string[] { "ò", "ó" },
                LetterKey.VK_U => new string[] { "ù", "ú" },
                _ => Array.Empty<string>(),
            };
        }

Review comment (suggestion):
Is it a complete set of accents for the Hebrew language?
If not, then please consider either adding these symbols to GetDefaultLetterKey or adding a complete set of Accents for the Hebrew language.

Code after:
                LetterKey.VK_R => new string[] { "ř" },
                LetterKey.VK_S => new string[] { "š" },
                LetterKey.VK_T => new string[] { "ť" },
                LetterKey.VK_U => new string[] { "ů", "ú" },
                LetterKey.VK_Y => new string[] { "ý" },
                LetterKey.VK_Z => new string[] { "ž" },
                _ => Array.Empty<string>(),
            };
        }

        // German
        private static string[] GetDefaultLetterKeyDE(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new string[] { "ä" },
                LetterKey.VK_E => new string[] { "€" },
                LetterKey.VK_O => new string[] { "ö" },
                LetterKey.VK_S => new string[] { "ß" },
                LetterKey.VK_U => new string[] { "ü" },
                _ => Array.Empty<string>(),
            };
        }

        // Hebrew
        private static string[] GetDefaultLetterKeyHE(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new string[] { "שׂ", "שׁ" },
                LetterKey.VK_G => new string[] { "ױ" },
                LetterKey.VK_H => new string[] { "ײ" },
                LetterKey.VK_U => new string[] { "וֹ", "וּ" },
                LetterKey.VK_Y => new string[] { "װ" },
                LetterKey.VK_COMMA => new string[] { "”", "״", "־", "–", "֫", "ֽ", "ֿ" },
                _ => Array.Empty<string>(),
            };
        }

        // Hungarian
        private static string[] GetDefaultLetterKeyHU(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new string[] { "á" },
                LetterKey.VK_E => new string[] { "é" },
                LetterKey.VK_I => new string[] { "í" },
                LetterKey.VK_O => new string[] { "ó", "ő", "ö" },
                LetterKey.VK_U => new string[] { "ú", "ű", "ü" },
                _ => Array.Empty<string>(),
            };