GitLab, alternative to GitHub, also contains a lot of beautiful open source themes.

Assorted typos including sphinx-buid in internationalization figure

To control trimming doctest flags manually, this adds new options
:trim-doctest-flags: and :no-trim-doctest-flags: to doctest
directives.  It helps to describes doctest module itself in python
doc (see #6698).

Add a special class `_Empty` to make the comparison of
:exclude-members: option simply.  It never matches to any members.

Close #8034: autodoc: :private-member: can take an list of member names

To build structured i18n imaging directory, figure_language_filename
now supports `{docpath}` token that is a dirname of the current
document.

Now :private-member: option can take an explicit list of member names to
be documented as its arguments (like :special-members: does).