[Docs] Japanese translation of docs/proton_c_conversion.md (#9927)

* start translation docs/ja/proton_c_conversion.md

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* Japanese translation is in progress.

* update

* Update docs/ja/proton_c_conversion.md

* Update docs/ja/proton_c_conversion.md

* Update docs/ja/proton_c_conversion.md

* Update docs/ja/proton_c_conversion.md

* Update docs/ja/proton_c_conversion.md

* Update docs/ja/proton_c_conversion.md

* Update docs/ja/proton_c_conversion.md

* Update docs/ja/proton_c_conversion.md

* Update docs/ja/proton_c_conversion.md

* update docs/ja/_summary.md: GPIO congtrol

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