[UX] Keyboard popup: add Z diacritics (#4910)

frontend/ui/data/keyboardlayouts/en_keyboard.lua

@@ -24,6 +24,8 @@ local _T_ = en_popup._T_
 local _t_ = en_popup._t_
 local _U_ = en_popup._U_
 local _u_ = en_popup._u_
+local _Z_ = en_popup._Z_
+local _z_ = en_popup._z_
 
 return {
     shiftmode_keys = {["Shift"] = true},
@@ -62,7 +64,7 @@ return {
               icon = "resources/icons/appbar.arrow.shift.png",
               width = 1.5
             },
-            { "Z",        "z",    "&",    "7",    "Я",    "я",    ":",    "7",    "Á",    "á",    "Ű",    "ű", },
+            { _Z_,        _z_,    "&",    "7",    "Я",    "я",    ":",    "7",    "Á",    "á",    "Ű",    "ű", },
             { "X",        "x",    "*",    "8",    "Ч",    "ч",    ";",    "8",    "Ø",    "ø",    "Ã",    "ã", },
             { "C",        "c",    "£",    "9",    "С",    "с",    "'",    "9",    "Í",    "í",    "Þ",    "þ", },
             { "V",        "v",    "<",    "‚",    "М",    "м",    "Ө",    "ө",    "Ñ",    "ñ",    "Ý",    "ý", },

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

@@ -185,6 +185,7 @@ return {
         east = "Ô",
         west = "Õ",
         south = "Ǫ",
+        southeast = "Œ",
         "Ō",
         "ɔ", -- open o, open-mid back rounded vowel IPA
         "ɒ", -- turned alpha, open back rounded vowel IPA
@@ -197,6 +198,7 @@ return {
         east = "ô",
         west = "õ",
         south = "ǫ",
+        southeast = "œ",
         "ō",
         "ɔ", -- open o, open-mid back rounded vowel IPA
         "ɒ", -- turned alpha, open back rounded vowel IPA
@@ -279,4 +281,22 @@ return {
         "ū",
         "ʌ", -- turned v, open-mid back unrounded vowel IPA
     },
+    _Z_ = {
+        "Z",
+        northeast = "Ź",
+        northwest = "Ζ", -- zeta uppercase
+        west = "Ž",
+        south = "ʐ", -- voiced retroflex sibilant fricative IPA
+        southeast = "ʒ", -- ezh, voiced palato-alveolar fricative IPA
+        southwest = "Ż",
+    },
+    _z_ = {
+        "z",
+        northeast = "ź",
+        northwest = "ζ", -- zeta lowercase
+        west = "ž",
+        south = "ʐ", -- voiced retroflex sibilant fricative IPA
+        southeast = "ʒ", -- ezh, voiced palato-alveolar fricative IPA
+        southwest = "ż",
+    },
 }