Add Persian translation

[ryonakano]

What Happened?

Originally reported by @pikhosh in the Translations Slack.

Persian translation for the website don't exist.

Steps to Reproduce

1. Open the website
2. Scroll down to display the language list
3. See Persian isn't listed

Expected Behavior

Persian language should be available as a possible selection.

OS Version

6.x (Odin)

Software Version

Latest release (I have run all updates)

Log Output

N/A

Hardware Info

N/A

[lewisgoddard]

We cleaned up languages that lacked a significant amount of translations, and since then the website doesn't appear to support Persian. https://l10n.elementary.io/projects/website/#languages We would need to generate new template files and add Persian to the list so translation can start.

[ryonakano]

Different from our desktop components, this repository doesn't seem to have translation templates and Weblate reports that as a warning so we've been disabling the feature of starting new language from the templates. It would be great if we could add templates and re-enable this function which would also allow translators themselves can start new translations of their languages!

[lewisgoddard]

This is blocked by #2955