feat: add dart language support (#1720)

* feat: add dart language support

* update dart words

* chore: add impements and Set words

static/languages/_groups.json

@@ -228,6 +228,7 @@
       "code_c",
       "code_csharp",
       "code_c++",
+      "code_dart",
       "code_javascript",
       "code_javascript_1k",
       "code_html",

static/languages/_list.json

@@ -124,6 +124,7 @@
   ,"code_c"
   ,"code_csharp"
   ,"code_c++"
+  ,"code_dart"
   ,"code_javascript"
   ,"code_javascript_1k"
   ,"code_html"

static/languages/code_dart.json

@@ -0,0 +1,79 @@
+{
+  "name": "code_dart",
+  "leftToRight": true,
+  "words": [
+    "()",
+    "[]",
+    "&&",
+    "||",
+    "abstract",
+    "any",
+    "as",
+    "assert",
+    "async",
+    "await",
+    "bool",
+    "break",
+    "case",
+    "catch",
+    "class",
+    "const ",
+    "continue",
+    "default",
+    "dependencies",
+    "do",
+    "double",
+    "Duration",
+    "dynamic",
+    "else",
+    "enum",
+    "every",
+    "export",
+    "extends",
+    "extension",
+    "factory",
+    "false",
+    "final",
+    "finally",
+    "for",
+    "get",
+    "if",
+    "implements",
+    "implicit",
+    "import",
+    "in",
+    "includes",
+    "int",
+    "is",
+    "join",
+    "library",
+    "List",
+    "Map",
+    "mixin",
+    "null",
+    "Object",
+    "on",
+    "operator",
+    "override",
+    "required",
+    "return",
+    "runtimeType",
+    "Set",
+    "set",
+    "static",
+    "String",
+    "switch",
+    "this",
+    "throw",
+    "toString",
+    "true",
+    "try",
+    "typedef",
+    "value",
+    "void",
+    "where",
+    "while",
+    "with",
+    "yield"
+  ]
+}