l10n: updated ar Arabic
l10n: updated ar Arabic

localizers: Ouss, Ahmad Gharbeia, Gabriele Kahlout, kwadronaut, Erin McConnell, Scharik Yousif, Ali Boshanab, Jennifer Helsby, ButterflyOfFire, Eric H., Thalia Rahme, Ramy Raoof, Jasmine Khalil, Yarno Ritzen

Review: https://weblate.securedrop.club/user/ramyraoof/ (localizationlab)
        https://weblate.securedrop.club/user/agharbeia/ (localizationlab)

https://lab.securedrop.club/bot/securedrop.git
copied from ca7bf58559c93bdcd068e3c6fd095596a051263e

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