Refactor code editor by moving the expand snippet out to a separate file (#2864)

* refactored CodeEditor by moving Snippet out

* fixed typo

browser/lib/CMLanguageList.js

@@ -0,0 +1,78 @@
+export const languageMaps = {
+  brainfuck: 'Brainfuck',
+  cpp: 'C++',
+  cs: 'C#',
+  clojure: 'Clojure',
+  'clojure-repl': 'ClojureScript',
+  cmake: 'CMake',
+  coffeescript: 'CoffeeScript',
+  crystal: 'Crystal',
+  css: 'CSS',
+  d: 'D',
+  dart: 'Dart',
+  delphi: 'Pascal',
+  diff: 'Diff',
+  django: 'Django',
+  dockerfile: 'Dockerfile',
+  ebnf: 'EBNF',
+  elm: 'Elm',
+  erlang: 'Erlang',
+  'erlang-repl': 'Erlang',
+  fortran: 'Fortran',
+  fsharp: 'F#',
+  gherkin: 'Gherkin',
+  go: 'Go',
+  groovy: 'Groovy',
+  haml: 'HAML',
+  haskell: 'Haskell',
+  haxe: 'Haxe',
+  http: 'HTTP',
+  ini: 'toml',
+  java: 'Java',
+  javascript: 'JavaScript',
+  json: 'JSON',
+  julia: 'Julia',
+  kotlin: 'Kotlin',
+  less: 'LESS',
+  livescript: 'LiveScript',
+  lua: 'Lua',
+  markdown: 'Markdown',
+  mathematica: 'Mathematica',
+  nginx: 'Nginx',
+  nsis: 'NSIS',
+  objectivec: 'Objective-C',
+  ocaml: 'Ocaml',
+  perl: 'Perl',
+  php: 'PHP',
+  powershell: 'PowerShell',
+  properties: 'Properties files',
+  protobuf: 'ProtoBuf',
+  python: 'Python',
+  puppet: 'Puppet',
+  q: 'Q',
+  r: 'R',
+  ruby: 'Ruby',
+  rust: 'Rust',
+  sas: 'SAS',
+  scala: 'Scala',
+  scheme: 'Scheme',
+  scss: 'SCSS',
+  shell: 'Shell',
+  smalltalk: 'Smalltalk',
+  sml: 'SML',
+  sql: 'SQL',
+  stylus: 'Stylus',
+  swift: 'Swift',
+  tcl: 'Tcl',
+  tex: 'LaTex',
+  typescript: 'TypeScript',
+  twig: 'Twig',
+  vbnet: 'VB.NET',
+  vbscript: 'VBScript',
+  verilog: 'Verilog',
+  vhdl: 'VHDL',
+  xml: 'HTML',
+  xquery: 'XQuery',
+  yaml: 'YAML',
+  elixir: 'Elixir'
+}