* Ukrainian localization is added

* Update HOWTO.md

* Update HOWTO-zh_TW.md

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* Rename CODE_OF_CONDUCT-ua.md to CODE_OF_CONDUCT-uk_UA.md

* Rename CODE_OF_CONDUCT-uk_UA.md to CODE_OF_CONDUCT-uk.md

* Update HOWTO-ar.md

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* Rename HOWTO-uk_UA.md to HOWTO-uk.md

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* Update HOWTO-zh_TW.md

* Update HOWTO.md