marble: Update Czech Republic to Czechia

Review Request #129690 - Created Dec. 20, 2016 and submitted

Information
Jiri Bohac
marble
Reviewers
marble
aacid
This year the country has oficially adopted the short name Czechia.
The short name has been entered to the UNTERM and UNGEGN databases in July 2016.
Czechia is used in iso_3166 since September 2016.

Update the CIA/World Factbook country description to the current version mentioning the short name.
Also update the flag description.
The remaining occurences of the political name have been updated with tha last update from geonames.org

This is a followup to 
https://git.reviewboard.kde.org/r/129644/
As suggested by Albert Astals Cid, fixing the name in i10n is not enough: 
country names are hardcoded in many places and they need to be fixed separately.

  
Dennis Nienhüser
Jiri Bohac
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit efc656caf6126ddc1b6b0823cf3ab280b75734cf by Albert Astals Cid on behalf of Jiri Bohac to branch master.
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