Hi,
Sorry for late response.
As you said, there are no way for i18n at this moment.
So we should support figure i18n which is introduced since Sphinx-1.4.
(search_image_for_language() is used for figure i18n feature internally)
Could you file your proposal to our issues of sphinxcontrib-blockdiag?
I will work it later. (Now I'm busy for Sphinx maintenance. so I can't answer you the schedule...)
As a workaround, please use sphinx.ext.ifconfig instead.
.. ifconfig:: language == 'ja'
.. blockdiag::
...
.. ifconfig:: language == 'en'
.. blockdiag::
...
Thanks,
Takeshi KOMIYA
2016年11月25日金曜日 5時54分49秒 UTC+9 Yusuke MURAOKA: