Hi Kanji Syuto,
This is probably not a block issue, but has to do with the following:
Unless you're using the multilang filter option, any user generated text will be displayed in the language used by the user who created it. If the courses have been created in Japanese, the course and activity names will be displayed in Japanese.
For the Moodle site to behave in a more multilingual fashion, you'd need to set up and activate the Multilang filter (site administration > plugins > filters > manage filters > multi-language content).
After this, you can add custom HTML to show Japanese, English and Mandarin / Cantonese text where you need to, following the instructions found in Moodle Docs: https://docs.moodle.org/38/en/Multi-language_content_filter
Also, @moderators, a move to General Help forum would make more sense