Github user milamberspace commented on the issue:
https://github.com/apache/cloudstack/pull/1619
Yes these files exists when your use the
tools/transifex/sync-transifex-ui.sh script to download/upload the L10N
resources files with Transifex.
These file are generated by the tx client program.
See: tools/transifex/README-transifex.txt
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