[UX] Keyboard: add @ and A diacritics (#4889)

Also rename std to en_keyboard.

frontend/ui/data/keyboardlayouts/en_keyboard.lua

@@ -1,27 +1,9 @@
-local _E_ = {
-    "E",
-    north = "Ë",
-    northeast = "É",
-    northwest = "È",
-    east = "Ê",
-    west = "Ẽ",
-    south = "Ę",
-    southeast = "€",
-    southwest = "Ė",
-    "Ē",
-}
-local _e_ = {
-    "e",
-    north = "ë",
-    northeast = "é",
-    northwest = "è",
-    east = "ê",
-    west = "ẽ",
-    south = "ę",
-    southeast = "€",
-    southwest = "ė",
-    "ē",
-}
+local en_popup = require("ui/data/keyboardlayouts/keypopup/en_popup")
+local _at = en_popup._at
+local _A_ = en_popup._A_
+local _a_ = en_popup._a_
+local _E_ = en_popup._E_
+local _e_ = en_popup._e_
 
 return {
     shiftmode_keys = {["Shift"] = true},
@@ -33,7 +15,7 @@ return {
         {  --  1           2       3       4       5       6       7       8       9       10      11      12
             { "Q",        "q",    "„",    "0",    "Й",    "й",    "?",    "!",    "Å",    "å",    "1",    "ª", },
             { "W",        "w",    "!",    "1",    "Ц",    "ц",    "(",    "1",    "Ä",    "ä",    "2",    "º", },
-            { _E_,        _e_,    "@",    "2",    "У",    "у",    ")",    "2",    "Ö",    "ö",    "3",    "¡", },
+            { _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", },
@@ -44,7 +26,7 @@ return {
         },
         -- second row
         {  --  1           2       3       4       5       6       7       8       9       10      11      12
-            { "A",        "a",    "…",    "@",    "Ф",    "ф",    "*",    "0",    "Ê",    "ê",    "Ş",    "ş", },
+            { _A_,        _a_,    "…",    _at,    "Ф",    "ф",    "*",    "0",    "Ê",    "ê",    "Ş",    "ş", },
             { "S",        "s",    "$",    "4",    "Ы",    "ы",    "+",    "4",    "Ë",    "ë",    "İ",    "ı", },
             { "D",        "d",    "%",    "5",    "В",    "в",    "-",    "5",    "Î",    "î",    "Ğ",    "ğ", },
             { "F",        "f",    "^",    "6",    "А",    "а",    "=",    "6",    "Ï",    "ï",    "Ć",    "ć", },

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

@@ -0,0 +1,60 @@
+return {
+    _at = {
+        "@",
+        north = "Ⓒ",
+        northeast = "™",
+        northwest = "Ⓡ",
+    },
+    _A_ = {
+        "A",
+        north = "Ä",
+        northeast = "Á",
+        northwest = "À",
+        east = "Â",
+        west = "Ã",
+        south = "Ą",
+        southeast = "Æ",
+        southwest = "Å",
+        "Ā",
+        "Ǎ",
+    },
+    _a_ = {
+        "a",
+        north = "ä",
+        northeast = "á",
+        northwest = "à",
+        east = "â",
+        west = "ã",
+        south = "ą",
+        southeast = "æ",
+        southwest = "å",
+        "ā",
+        "ǎ",
+    },
+    _E_ = {
+        "E",
+        north = "Ë",
+        northeast = "É",
+        northwest = "È",
+        east = "Ê",
+        west = "Ẽ",
+        south = "Ę",
+        southeast = "€",
+        southwest = "Ė",
+        "Ē",
+        "Ě",
+    },
+    _e_ = {
+        "e",
+        north = "ë",
+        northeast = "é",
+        northwest = "è",
+        east = "ê",
+        west = "ẽ",
+        south = "ę",
+        southeast = "€",
+        southwest = "ė",
+        "ē",
+        "ě",
+    },
+}

frontend/ui/widget/virtualkeyboard.lua

@@ -437,6 +437,7 @@ local VirtualKeyboard = FocusManager:new{
 
 local lang_to_keyboard_layout = {
     el = "el_keyboard",
+    en = "en_keyboard",
     es = "es_keyboard",
     fr = "fr_keyboard",
     ja = "ja_keyboard",
@@ -445,8 +446,9 @@ local lang_to_keyboard_layout = {
 }
 
 function VirtualKeyboard:init()
-    local lang = G_reader_settings:readSetting("language")
-    local keyboard_layout = lang_to_keyboard_layout[lang] or "std"
+    local lang = G_reader_settings:readSetting("language") or "en"
+    if lang == "C" then lang = "en" end
+    local keyboard_layout = lang_to_keyboard_layout[lang]
     local keyboard = require("ui/data/keyboardlayouts/" .. keyboard_layout)
     self.KEYS = keyboard.keys
     self.shiftmode_keys = keyboard.shiftmode_keys