[UX] Keyboard popup: k and l diacritics (#4908)

There doesn't seem to be much going on in k-land, and I like using proper hyphens and dashes.

frontend/ui/data/keyboardlayouts/en_keyboard.lua

@@ -12,6 +12,10 @@ local _D_ = en_popup._D_
 local _d_ = en_popup._d_
 local _I_ = en_popup._I_
 local _i_ = en_popup._i_
+local _K_ = en_popup._K_
+local _k_ = en_popup._k_
+local _L_ = en_popup._L_
+local _l_ = en_popup._l_
 local _O_ = en_popup._O_
 local _o_ = en_popup._o_
 local _S_ = en_popup._S_
@@ -49,8 +53,8 @@ return {
             { "G",        "g",    ":",    ";",    "П",    "п",    "Ү",    "ү",    "Ô",    "ô",    "Č",    "č", },
             { "H",        "h",    "\"",   "'",    "Р",    "р",    "Ұ",    "ұ",    "Œ",    "œ",    "Đ",    "đ", },
             { "J",        "j",    "{",    "[",    "О",    "о",    "Қ",    "қ",    "Ù",    "ù",    "Š",    "š", },
-            { "K",        "k",    "}",    "]",   "Л",    "л",    "Ж",    "ж",    "Û",    "û",    "Ž",    "ž", },
-            { "L",        "l",    "_",    "-",    "Д",    "д",    "Э",    "э",    "Ÿ",    "ÿ",    "Ő",    "ő", },
+            { _K_,        _k_,    "}",    "]",   "Л",    "л",    "Ж",    "ж",    "Û",    "û",    "Ž",    "ž", },
+            { _L_,        _l_,    "_",    "-",    "Д",    "д",    "Э",    "э",    "Ÿ",    "ÿ",    "Ő",    "ő", },
         },
         -- third row
         {  --  1           2       3       4       5       6       7       8       9       10      11      12

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

@@ -129,6 +129,54 @@ return {
         "ī",
         "ɪ", -- small capital letter i, near-close front unrounded vowel IPA
     },
+    _K_ = {
+        "K",
+        north = '"',
+        south = "Ķ",
+        east = "–", -- hyphen minus
+        southeast = "—", -- em dash
+        southwest = "–", -- en dash
+        "Κ", -- kappa uppercase
+        "κ", -- kappa lowercase
+    },
+    _k_ = {
+        "k",
+        north = '"',
+        south = "ķ",
+        east = "–", -- hyphen minus
+        southeast = "—", -- em dash
+        southwest = "–", -- en dash
+        "Κ", -- kappa uppercase
+        "κ", -- kappa lowercase
+    },
+    _L_ = {
+        "L",
+        north = "'",
+        northeast = "Ĺ",
+        northwest = "Ľ",
+        east = "+",
+        west = "Ł",
+        south = "Ļ",
+        southeast = "£",
+        southwest = "ꝉ", -- abbreviation for vel (Latin or)
+        "Λ",
+        "λ",
+        "ɫ", -- dark l, velarized alveolar lateral approximant IPA
+    },
+    _l_ = {
+        "l",
+        north = "'",
+        northeast = "ĺ",
+        northwest = "ľ",
+        east = "+",
+        west = "ł",
+        south = "ļ",
+        southeast = "£",
+        southwest = "ꝉ", -- abbreviation for vel (Latin or)
+        "Λ",
+        "λ",
+        "ɫ", -- dark l, velarized alveolar lateral approximant IPA
+    },
     _O_ = {
         "O",
         north = "Ó",