String freeze exception for Krita 5.3/6.0 branch

[Drawpile]

Hello translators,

there's some additions to Krita's stable branch (called krita/6.0, but it also serves 5.3 releases simultaneously) and manual for the Android platform. One is to get the "donation" stuff back into the application in a way that complies with Google's requirements and the other is to give the user a way to change the interface scale to make the application work on more devices without users having to change the settings of the entire operating system.

The code additions are here:

* https://invent.kde.org/graphics/krita/-/merge_requests/2787/diffs
* https://invent.kde.org/graphics/krita/-/merge_requests/2836/diffs

And the manual ones here:

* https://invent.kde.org/documentation/docs-krita-org/-/merge_requests/406/diffs
* https://invent.kde.org/documentation/docs-krita-org/-/merge_requests/408

Regards
Carsten