now , webduino function just support english and chinese, hope someone can help us to development multilanguage support.
https://bit.webduino.com.cn/blockly/?lang=zh-hans (chinese mainland)
Blockly source code on github
if someone want to help us for multilanguage support, just fork github . When you are finished, you can submit the application at githhub
And the building block tool itself has the support multinational language function, may increase the language file directly, should be able to support