Optional update for datovka

This update provides the latest version of Datovka.

Datovka can be used for accessing the Czech eGov system "Datove schranky".
Version 4.12.0 contains the following updates:

- Bigger attachments allowed (50MB)
- HiDPI icons
- Other minor updates and feature enhancements

Fixed bugs
bnc#1104620
Datovka package needs to be kept at latest version in openSUSE distribution
Selected Binaries
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