[UX] Keyboard popup: add Y diacritics (#4935)

frontend/ui/data/keyboardlayouts/en_keyboard.lua

@@ -46,6 +46,8 @@ local _U_ = en_popup._U_
 local _u_ = en_popup._u_
 local _W_ = en_popup._W_
 local _w_ = en_popup._w_
+local _Y_ = en_popup._Y_
+local _y_ = en_popup._y_
 local _Z_ = en_popup._Z_
 local _z_ = en_popup._z_
 
@@ -62,7 +64,7 @@ return {
             { _E_,        _e_,    _at,    "2",    "У",    "у",    ")",    "2",    "Ö",    "ö",    "3",    "¡", },
             { _R_,        _r_,    "#",    "3",    "К",    "к",    "~",    "3",    "ß",    "ß",    "4",    "¿", },
             { _T_,        _t_,    "+",    "=",    "Е",    "е",    "Ә",    "ә",    "À",    "à",    "5",    "¼", },
-            { "Y",        "y",    "€",    "(",    "Н",    "н",    "І",    "і",    "Â",    "â",    "6",    "½", },
+            { _Y_,        _y_,    "€",    "(",    "Н",    "н",    "І",    "і",    "Â",    "â",    "6",    "½", },
             { _U_,        _u_,    "‰",    ")",    "Г",    "г",    "Ң",    "ң",    "Æ",    "æ",    "7",    "¾", },
             { _I_,        _i_,    "|",   "\\",    "Ш",    "ш",    "Ғ",    "ғ",    "Ü",    "ü",    "8",    "©", },
             { _O_,        _o_,    "?",    "/",    "Щ",    "щ",    "Х",    "х",    "È",    "è",    "9",    "®", },

frontend/ui/data/keyboardlayouts/keypopup/en_popup.lua

@@ -436,6 +436,28 @@ return {
         northwest = "ʍ", -- inverted w, voiceless labial-velar approximant IPA
         east = "ƿ", -- wynn, Old English for /w/
     },
+    _Y_ = {
+        "Y",
+        north = "Ŷ",
+        northeast = "Ý",
+        northwest = "Ỳ",
+        east = "Ÿ",
+        west = "Ỹ",
+        south = "ʎ", -- palatal lateral approximant IPA (looks like mirror lambda, but actually upside down y)
+        southeast = "ʏ", -- near-close, near-front rounded vowel IPA
+        southwest = "Υ", -- uppercase upsilon
+    },
+    _y_ = {
+        "y",
+        north = "ŷ",
+        northeast = "ý",
+        northwest = "ỳ",
+        east = "ÿ",
+        west = "ỹ",
+        south = "ʎ", -- palatal lateral approximant IPA (looks like mirror lambda, but actually upside down y)
+        southeast = "ʏ", -- near-close, near-front rounded vowel IPA
+        southwest = "υ", -- lowercase upsilon
+    },
     _Z_ = {
         "Z",
         northeast = "Ź",