Fix Step infobrowser and examples localization for 19.12

[Yuri Chornoivan]

Hi,

Step infobrowser localization was somewhat broken during 19.12 release cycle.

This can be fixed by the following differential revision:

https://phabricator.kde.org/D25405

The revision requires two new localization files, step_objinfo_files.po and 
step_example_files.po, for a translation locale to be present in the source 
archive of Step to localize descriptions, tutorials and examples at the build 
time.

The descriptions, tutorials and examples for locales without 
step_objinfo_files.po and step_example_files.po will not be localized 
silently. Step should readily build without them. The current script requires 
Python 2 to build the translation but there is a patch to port it to Python 3.

https://phabricator.kde.org/D25532

Is it possible to include this fix into 19.12 release this late in the release 
cycle or is it better to wait for the next release?

Thanks in advance for your answers.

Best regards,
Yuri