Replace moment.js

[derneuere]

According to the project status there are more modern and lightweight solutions: https://momentjs.com/docs/#/-project-status/

We should consider replacing it with luxon https://moment.github.io/luxon/#/moment

[derneuere]

I already added luxon to the frontend and used it in a couple of places. The rest is just applying it to the rest of the code base.

[5m4u66y]

I started to work on this issue, and I have a few questions.

• What would be the best way to avoid i18n.resolvedLanguage.replace("_", "-") each time to get the current locale?
• luxon does not provide ordinal suffix. Do we need to implement a way to restore them, or is it OK not to have suffixes like we had with moment.js? In my opinion we should stick without ordinal notation (https://www.editarians.com/cardinals-ordinals/)
• regarding durations, luxon does not provide the nice "A few seconds ago" that moment.js has, and the toHuman function does not output a very good "humanized" string (see Duration#toHuman issue). For example for jobs duration, it outputs "xxxxx milliseconds". While moving to luxon, I would like to avoid adding another dependency to something like humanize-duration. Any suggestions?

[derneuere]

• At the moment, we use weblate to allow users with no technical background to help to translate the frontend. Weblate seems to have the default to use "_" instead of "-" for languages. There is probably a setting for that somewhere, which would be the ideal fix.
• Yeah, I think that that's fine. I think we only use it in the sidebar for the timestamp.
• It looks to me like they are trying to add this in a future release. I think it's fine for now to add humanize-duration, but we should keep an issue open to remove it, once Luxon has that functionality.

Looking forward to your pull request 😄