[JA] Translate mix-tasks 1.2.0 (#2353)
[JA] Translate mix-tasks 1.2.0 (#2353)

* translate ja mix-tasks 1.2.0

* fix typo

* Update ja/lessons/basics/mix-tasks.md

Co-authored-by: marocchino <924c959d2f947b2ae3fdeabf5d926a239c5d5ef9@users.noreply.github.com>

* fix review

* fix review

* fix review

* fix review

Co-authored-by: marocchino <924c959d2f947b2ae3fdeabf5d926a239c5d5ef9@users.noreply.github.com>
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