* handle implied READ_EXTERNAL_STORAGE permissions, which trigger a
  permissions prompt on installs with Privileged Extension (#1702)

* sanitize index data to reduce the threats from the server

* set Read Timeout to trigger mirror use when reads are slow

* fix missing icons for those who do not use WiFi (#1592)

* use separate titles for Updates pref and Updates tab, so that they
  can be better translated

* UI fixes from @ConnyDuck (#1636, #1618)