Add Arabic locale

[randa-11295]

This branch adds Arabic language support to the project, including localisation and translations. RTL adjustments will be handled in a separate step if necessary

[m-mohr]

Thank you very much! This is an awesome addition to STAC Browser.

I've left some comments for your consideration.

What's your experience around RTL? Happy to collaborate on improvements that are needed for RTL support.

Also, I'd like to invite you to join Crowdin, where we manage the translations.
Which email adress shall I use for the invite?

[randa-11295]

Thank you for your feedback! I’ll review your comments and make the needed improvements.

I have good experience with RTL since I work with both Arabic and English. I'd love to help improve RTL support.

It would be great to join the Crowdin community! Please send the invite to
[email protected]
Looking forward to contributing!

[randa-11295]

Thank you for your feedback! I’ve reviewed your comments and made the necessary updates:
-Fixed translation inconsistencies.
-Updated fields.json with accurate Arabic translations.
-Removed unnecessary comments from datepicker and duration components.
Let me know if there are any specific areas that still need adjustments.

[m-mohr]

Thank you very much, the PR looks very good now. I've sent you an invite to join the CrowdIn translation tool. If you did not receive it, please let me know and I'll resend it.

I have good experience with RTL since I work with both Arabic and English. I'd love to help improve RTL support.

Wonderful. I meant to ask, what's your experience with RTL in STAC Browser? I think we need some adjustments there to cater better for Arabic and RTL. For example, set the dir property in HTML. This likely needs a new config option in the config.js locales.
I've opened a separate issue where we can discuss further steps: #574 I'd be happy to collaborate with you on this issue. As you are a web dev, feel free to start a PR if you want.

Thanks again, I'll merge this for now.