Option to change default settings

[Draculente]

As a user I want to have the option to change the defaults of the currently "per-device" settings. If I log in on a new device, I want those default settings to take effect, but I want to have the option to change those on a per device basis.

These settings include:

• The UI size
• The reader settings (reader color, font size etc.)
• The swipe actions in the readinglist
• potentially more...

These minor improvements are warranted, because some mobile browsers have issues where they earase the local storage of websites regularly, thereby removing "per-device" settings.

PS: Don't remove per-device settings when being logged out?