PDF.js: dark theme and viewer language

The reader-dark.json profile

File: media/plg_system_wtpdfjs-config/reader-dark.json. Dark theme affects the interface; it does not invert PDF page colors. Set localeProperties.lang="en-US" for English.

JSON example

{
  "defaultZoomValue": "page-width",
  "viewerCssTheme": 2,
  "localeProperties": {
    "lang": "ru"
  },
  "sidebarViewOnLoad": 0,
  "viewOnLoad": 1
}