Allow users to set their timezone and locale

[luchaos]

For displaying timestamps in web interface. Leverage Carbon PHP library features for transformation on backend side and moment.js for the frontend.

Related:

#701

[KingS1zzle]

This would be a cool quality of life feature. Since I joined I decided to add a second clock just to keep track of when things are posted.

This isn't that much of a hassle but would be a better solution than adding a second clock to your pc and hovering over to see when it was posted.

[redwizard42]

Yeah. I always see the timestamps on the website and my brain goes, "What's that in local time?" and then I forget what timezone the site is in and I give up.

[suspect15]

I hate to admit it, but I'm the same way. GMT basically means nothing to me as I can never easily orient myself to it despite it only being a simple subtraction.