Examine source code of Il-2 Historical

{
  "theme": {
    "images": {
      "theme_frame": "il-2.JPG"
    },
    "colors": {
      "frame": "#c9c5c5",
      "tab_background_text": "#303030"
    }
  },
  "version": "2.0",
  "name": "Il-2 Historical",
  "manifest_version": 2,
  "description": "Ruský letoun il-2 v barvách historické černo-bíle fotografie. \nRussian sturmovik il-2 in historical photo collors."
}