`sphinx-apidoc` command now have a `--version` option to show version information and exit. closes #1518

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branch : stable
* adding new sphinx supported system languages. closes #1403.
* update all catalogs from transifex.

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branch : stable
* tiny update for changes

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branch : stable
* On Python3 environment, docutils.conf with 'source_link=true' in the general section cause type error. Closes #1531

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branch : stable
merge with stable