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

Code before:
                LetterKey.VK_PERIOD => new[] { "“", "”", "«", "»", },
                _ => Array.Empty<string>(),
            };
        }

        // Hebrew
        private static string[] GetDefaultLetterKeyHE(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new[] { "שׂ", "שׁ", "\u05b0" },
                LetterKey.VK_B => new[] { "׆" },
                LetterKey.VK_E => new[] { "\u05b8", "\u05b3", "\u05bb" },
                LetterKey.VK_G => new[] { "ױ" },
                LetterKey.VK_H => new[] { "ײ", "ײַ", "ׯ", "\u05b4" },
                LetterKey.VK_M => new[] { "\u05b5" },
                LetterKey.VK_P => new[] { "\u05b7", "\u05b2" },
                LetterKey.VK_S => new[] { "\u05bc" },
                LetterKey.VK_T => new[] { "ﭏ" },
                LetterKey.VK_U => new[] { "וֹ", "וּ", "װ", "\u05b9" },
                LetterKey.VK_X => new[] { "\u05b6", "\u05b1" },
                LetterKey.VK_Y => new[] { "ױ" },
                LetterKey.VK_COMMA => new[] { "”", "’", "״", "׳" },
                LetterKey.VK_PERIOD => new[] { "\u05ab", "\u05bd", "\u05bf" },
                LetterKey.VK_MINUS => new[] { "–", "־" },
                LetterKey.VK_QUOT_ => new[] { "”", "’", "'", },
                _ => Array.Empty<string>(),
            };
        }

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

        // Romanian
        private static string[] GetDefaultLetterKeyRO(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new[] { "ă", "â" },

Review comment (bug):
I think build is failing because of this mention to `VK_QUOT_`. Have you been able to build locally?

Code after:
                LetterKey.VK_U => new[] { "ú", "û", "ü", "ū", "ǖ" },
                LetterKey.VK_V => new[] { "v\u0307", "ṿ", "ᵛ" },
                LetterKey.VK_Y => new[] { "̀y" },
                LetterKey.VK_Z => new[] { "ż", "ž", "z\u0304", "z\u0327", "ẓ", "z\u0324", "ẕ" },
                LetterKey.VK_PERIOD => new[] { "’", "ʾ", "ʿ", "′", "…" },
                _ => Array.Empty<string>(),
            };
        }

        // Slovak
        private static string[] GetDefaultLetterKeySK(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new[] { "á", "ä" },
                LetterKey.VK_C => new[] { "č" },
                LetterKey.VK_D => new[] { "ď" },
                LetterKey.VK_E => new[] { "é", "€" },
                LetterKey.VK_I => new[] { "í" },
                LetterKey.VK_L => new[] { "ľ", "ĺ" },
                LetterKey.VK_N => new[] { "ň" },
                LetterKey.VK_O => new[] { "ó", "ô" },
                LetterKey.VK_R => new[] { "ŕ" },
                LetterKey.VK_S => new[] { "š" },
                LetterKey.VK_T => new[] { "ť" },
                LetterKey.VK_U => new[] { "ú" },
                LetterKey.VK_Y => new[] { "ý" },
                LetterKey.VK_Z => new[] { "ž" },
                LetterKey.VK_COMMA => new[] { "„", "“", "‚", "‘", "»", "«", "›", "‹" },
                _ => Array.Empty<string>(),
            };
        }

        // Gaeilge (Irish language)
        private static string[] GetDefaultLetterKeyGA(LetterKey letter)
        {
            return letter switch
            {
                LetterKey.VK_A => new[] { "á" },
                LetterKey.VK_E => new[] { "é", "€" },
                LetterKey.VK_I => new[] { "í" },
                LetterKey.VK_O => new[] { "ó" },
                LetterKey.VK_U => new[] { "ú" },
                LetterKey.VK_COMMA => new[] { "“", "”", "‘", "’" },
                _ => Array.Empty<string>(),
            };
        }

        // Gàidhlig (Scottish Gaelic)
        private static string[] GetDefaultLetterKeyGD(LetterKey letter)
        {