update Japanese language for code editor

[bookstack] / package.json

{
  "private": true,
  "scripts": {
    "build": "gulp build",
    "production": "gulp build --production",
    "dev": "gulp",
    "watch": "gulp",
    "permissions": "chown -R $USER:$USER bootstrap/cache storage public/uploads"
  },
  "devDependencies": {
    "babelify": "^7.3.0",
    "browserify": "^14.3.0",
    "envify": "^4.0.0",
    "gulp": "3.9.1",
    "gulp-autoprefixer": "3.1.1",
    "gulp-clean-css": "^3.0.4",
    "gulp-livereload": "^3.8.1",
    "gulp-minify-css": "1.2.4",
    "gulp-plumber": "1.1.0",
    "gulp-sass": "3.1.0",
    "gulp-uglify": "2.1.2",
    "vinyl-buffer": "^1.0.0",
    "vinyl-source-stream": "^1.1.0",
    "watchify": "^3.9.0",
    "yargs": "^7.1.0"
  },
  "dependencies": {
    "angular": "^1.5.5",
    "angular-animate": "^1.5.5",
    "angular-resource": "^1.5.5",
    "angular-sanitize": "^1.5.5",
    "angular-ui-sortable": "^0.17.0",
    "axios": "^0.16.1",
    "babel-polyfill": "^6.23.0",
    "babel-preset-es2015": "^6.24.1",
    "clipboard": "^1.7.1",
    "codemirror": "^5.26.0",
    "dropzone": "^4.0.1",
    "gulp-util": "^3.0.8",
    "markdown-it": "^8.3.1",
    "markdown-it-task-lists": "^2.0.0",
    "moment": "^2.12.0",
    "vue": "^2.2.6",
    "vuedraggable": "^2.14.1"
  },
  "browser": {
    "vue": "vue/dist/vue.common.js"
  }
}