translated guide/contributing.gdoc (thanks to ichii)
translated guide/contributing/issues.gdoc (thanks to ichii)
translated guide/contributing/build.gdoc (thanks to ichii)
translated guide/contributing/patchesCore.gdoc (thanks to ichii)
translated guide/contributing/patchesDoc.gdoc (thanks to ichii)
tweaked titles under contributing at toc.yml
Merge pull request #106 from nobeans/guide/contributing-series

translated a series of contributing