Localize summary numbers

[DL6ER]

By submitting this pull request, I confirm the following:

• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes, and have included unit tests where possible.
• I am willing to help maintain this change if there are issues with it later.
• I give this submission freely and claim no ownership.
• It is compatible with the EUPL 1.2 license
• I have squashed any insignificant commits. (git rebase)

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What does this PR aim to accomplish?:

See title

How does this PR accomplish the above?:

Ensure number formatting is taking place in browser-scope to use client- instead of browser-based number localization. This relies on the locale being correctly applied in the user's browser.

Screenshots

What documentation changes (if any) are needed to support this PR?:

None

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/change-decimal-and-thousands-separators-in-dashboard-according-to-local-settings/31168/12

[yubiuser]

Can you include a fix for the long-term database as well?

https://github.com/pi-hole/AdminLTE/blob/193fb7fcb9daff08eae5b48ab9895dd35bff4233/scripts/pi-hole/js/db_queries.js#L151-L176

At least for me, the percentage got an . instead of a ,

[DL6ER]

Left is English, Right is German browser

[yubiuser]

Confirm working

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v5-13-web-v5-10-and-core-v5-8-released/52254/1

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-update-reduced-number-of-blocked-domains/52599/11

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/zahlenformat-darstellung-im-dashboard/52657/2