launch Arabic on f-droid.org

https://hosted.weblate.org/languages/ar/f-droid/

Here are the final things left to do before we can launch Arabic on f-droid.org:

client app 100% translated
core web pages in website pages 100% translated
10 apps in fdroiddata 100% translated
"chrome" strings 100% translated
merge request with blog post announcing launch (for example, Romanian

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