[UX] Keyboard popup: add C diacritics (#4912)

frontend/ui/data/keyboardlayouts/en_keyboard.lua

@@ -6,6 +6,8 @@ local _A_ = en_popup._A_
 local _a_ = en_popup._a_
 local _B_ = en_popup._B_
 local _b_ = en_popup._b_
+local _C_ = en_popup._C_
+local _c_ = en_popup._c_
 local _E_ = en_popup._E_
 local _e_ = en_popup._e_
 local _D_ = en_popup._D_
@@ -66,7 +68,7 @@ return {
             },
             { _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", },
+            { _C_,        _c_,    "£",    "9",    "С",    "с",    "'",    "9",    "Í",    "í",    "Þ",    "þ", },
             { "V",        "v",    "<",    "‚",    "М",    "м",    "Ө",    "ө",    "Ñ",    "ñ",    "Ý",    "ý", },
             { _B_,        _b_,    ">",    prd,    "И",    "и",    "Һ",    "һ",    "Ó",    "ó",    "†",    "‡", },
             { "N",        "n",    "‘",    "↑",    "Т",    "т",    "Б",    "б",    "Ú",    "ú",    "–",    "—", },

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

@@ -65,6 +65,28 @@ return {
         northeast = "β",
         northwest = "♭",
     },
+    _C_ = {
+        "C",
+        north = "Ċ",
+        northeast = "Ć",
+        northwest = "🄯", -- copyleft symbol
+        east = "Ĉ",
+        west = "Č",
+        south = "Ç",
+        southeast = "©", -- copyright symbol
+        southwest = "¢", -- cent sign
+    },
+    _c_ = {
+        "c",
+        north = "ċ",
+        northeast = "ć",
+        northwest = "🄯", -- copyleft symbol
+        east = "ĉ",
+        west = "č",
+        south = "ç",
+        southeast = "©", -- copyright symbol
+        southwest = "¢", -- cent sign
+    },
     _D_ = {
         "D",
         north = "Đ",