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Respect user's locale when rendering the date range in the repo activity page (#21410 )

# Description
Previously, to make the date range understood by all, we used the format
"2006-01-02" for the dates as it's locale-generic.

This commit changes the rendering logic. Instead of rendering the date
on the server, we send a formatted computer-readable timestamp. The
client's javascript then renders it according to the user's locale.

This approach is reusable across the codebase, any `<time></time>` tag
with the data-format="date" attribute would get rendered according to
the user's chosen locale.

## Previous View

![image](https://user-images.githubusercontent.com/20454870/195099143-e1c5df86-282a-42f1-898f-a36bb5fe7c2f.png)

## New View

### English

![image](https://user-images.githubusercontent.com/20454870/195099301-5cda4eab-4012-49d5-97e5-b1f9cada9c06.png)

### French

![image](https://user-images.githubusercontent.com/20454870/195099434-ce23e394-8d65-4c4c-8ac8-8b96bc9044f3.png)

### Portuguese

![image](https://user-images.githubusercontent.com/20454870/195099559-9a7aed28-944a-45ec-bedb-64403e3faede.png)

### Italian

![image](https://user-images.githubusercontent.com/20454870/195099661-17758d55-3fe0-4797-879b-d45de0ee8ba3.png)

# References
* #21380 
* #21387
* #21396

Inspiration:

I think either differentiating by class, or probably better by a custom
attribute such as `data-format` or similar, is the best course of
action.

_Originally posted by @delvh in
https://github.com/go-gitea/gitea/issues/21396#issuecomment-1274424788_
      


Resolves #21380

Signed-off-by: Yarden Shoham <hrsi88@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>