Requested at T185023#4123117
A rough to-do list:
- Get bot approval on arwiki (Approval)
- Add translations to the code repository and ensure it will work on other wikis
- Add translations to meta:Community Tech/Popular pages bot (not strictly required)
- Add the configuration for the interested WikiProjects.
- Make the bot run as a separate cron job, so that it doesn't have to wait for the long-running enwiki job to finish.