turris-diagnostics: update to version 15.0.0

Added

• detection of binary files in dump_file and their dump in base64 encoding instead of direct inclusion
• call to hwinfo in lshw module

Fixed

• firmare_devices: not found error in firmware module
• red herring SSL error in turris-webs module
• missing a module name in headers

Changed

• packages: limit updater keys we query to /etc/updater/keys/*.pub thus ignoring the *.pub.sig files that are also stored there.
• Makefile used to manage translations was improved.

Implements #800 (closed)