Add Czech keyboard layout (#11769)

Fixes #11339.

frontend/ui/data/keyboardlayouts/cs_keyboard.lua

@@ -0,0 +1,57 @@
+local cs_keyboard = require("util").tableDeepCopy(require("ui/data/keyboardlayouts/sk_keyboard"))
+
+local keys = cs_keyboard.keys
+
+keys[1][2][1] = {
+    "2",
+    north = "ě",
+    northeast = "Ě",
+    east = "~",
+    southeast = "/",
+    south = "@",
+    southwest = "https://",
+    west = "http://",
+    northwest = "Ĺ",
+    alt_label = "ě",
+}
+keys[1][2][2] = {
+    "ě",
+    north = "2",
+    northeast = "Ě",
+    east = "~",
+    southeast = "/",
+    south = "@",
+    southwest = "https://",
+    west = "http://",
+    northwest = "ĺ",
+    alt_label = "2",
+}
+
+keys[1][5][1] = {
+    "5",
+    north = "ř",
+    northeast = "Ř",
+    east = "¾",
+    southeast = "‱",
+    south = "%",
+    southwest = "‰",
+    west = "⅔",
+    northwest = "Ŕ",
+    alt_label = "ř",
+}
+keys[1][5][2] = {
+    "ř",
+    north = "5",
+    northeast = "Ř",
+    east = "¼",
+    southeast = "‱",
+    south = "%",
+    southwest = "‰",
+    west = "½",
+    northwest = "ŕ",
+    alt_label = "5",
+}
+
+keys[5][4].label = "mezera"
+
+return cs_keyboard

frontend/ui/widget/virtualkeyboard.lua

@@ -801,6 +801,7 @@ local VirtualKeyboard = FocusManager:extend{
         ar = "ar_keyboard",
         bg_BG = "bg_keyboard",
         bn = "bn_keyboard",
+        cs = "cs_keyboard",
         da = "da_keyboard",
         de = "de_keyboard",
         el = "el_keyboard",