Can't read pdf's on iPads or iPhones

[libreliodev]

This seems to be related to mozilla/pdf.js#4898.

Not a major issue anyway, because we have native apps: https://github.com/libreliodev/iOS

[AlirezaAlgo]

@libreliodev pdfreader is created for desktop devices. It can run on iPads & iPhones. But Apparently it does not support partial loading. And We should create another interface for using the application.