Merge pull request #1956 from blackpuppy/zh

[en] correct wrong position of ending bracket
Merge branch 'master' into zh
Merge pull request #1957 from blackpuppy/zh

remove ro and sr from Makefile
Merge branch 'master' into zh
[zh_CN] fix build warning in /zh/models/deleting-data.rst
[zh_CN] done /zh/models/datasources.rst