Add Hungarian localization

[gcsecsey]

Proposed Changes

Studio currently supports 20 languages but Hungarian was not among them. This PR adds Hungarian as the 21st supported language with full translation coverage.

• Add studio-hu.jed.json translation file exported from GlotPress (955/955 strings, 100%)
• Added hu: 'Magyar' to the supported locales map
• Update localization docs to include Hungarian in the GlotPress bulk export step

Testing Instructions

• npm start
• Go to Settings > Language
• Verify "Magyar" appears in the language dropdown
• Select it and verify the UI switches to Hungarian
• Navigate through different screens (sites list, settings, sync dialog, assistant) to verify translations display correctly
• Create a new site and check that the site language is set to Hungarian

[wpmobilebot]

📊 Performance Test Results

Comparing da5fa6c vs trunk

site-editor

Metric	trunk	da5fa6c	Diff	Change
load	2694.00 ms	2711.00 ms	+17.00 ms	⚪ 0.0%

site-startup

Metric	trunk	da5fa6c	Diff	Change
siteCreation	7058.00 ms	6095.00 ms	-963.00 ms	🟢 -13.6%
siteStartup	3927.00 ms	3938.00 ms	+11.00 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[nightnei]

It's awesome that we have one more translation 🔥
LGTM and works as expected 👍 I noticed only one missed translation - Improt/Export in the main menu:

[gcsecsey]

It's awesome that we have one more translation 🔥 LGTM and works as expected 👍 I noticed only one missed translation - Improt/Export in the main menu:

Thanks for reviewing and testing it @nightnei! I don't have a better translation for "Import/Export", these are used as-is in Hungarian as well. 🙂

[ivan-ottinger]

Nice! Happy to see another language added! It makes me want to add more. 🙂