add Arabic translation

[AhmadKazimi]

No description provided.

[google-cla]

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[arriolac]

Thanks! One more translation is missing here for a11y_back. Other than that, LGTM

[riggaroo]

Hi,
Thanks for your contribution, however Sunflower is going to be archived in favour of maintaining a smaller set of up-to-date set of compose-samples, that can be found here: https://github.com/android/compose-samples, as well as snippets that can be found here: https://github.com/android/snippets.

Please feel free to keep your fork up-to-date for your learning, but this repository will be archived shortly.