Add Hungarian (hu) translations

[csorbalazs306]

Adds real Hungarian translations for all four language files. The existing hu.*.xlf files on l10n_main (see PR #434) contain only state="needs-translation" placeholders (English copies) — this PR replaces them with actual translations:

• Resources/Private/Language/hu.locallang.xlf — 220 units
• Resources/Private/Language/hu.locallang_db.xlf — 113 units
• Resources/Private/Language/hu.locallang_mod.xlf — 3 units
• Resources/Private/Language/hu.locallang_csh_fe_users.xlf — 1 unit

All units are state="final" + approved="yes", source-aligned with en.*.xlf (unit ids in identical order). %s placeholders preserved; format strings (m/d/Y, MM/DD/YYYY) and loanwords (Captcha, Fax, Offline/Online, UID) left untranslated on purpose.

How to test: checkout this branch, enable Hungarian as a frontend/backend language in a TYPO3 site, and check that femanager frontend forms, notification emails and backend labels show Hungarian text.

[sbusemann]

@csorbalazs306 -
We are using Crowdin for our translation. Learn how to use the service:
https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Localization/TranslationServer/Crowdin.html#localization-with-crowdin

Translation for femanager can be found at: https://crowdin.com/project/typo3-extension-femanager/

[csorbalazs306]

Thanks @sbusemann — understood, translations for femanager should be contributed via Crowdin (https://crowdin.com/project/typo3-extension-femanager/). Closing this PR and will contribute the Hungarian translations there instead. The translations from this PR are kept on the fork branch l10n_main (csorbalazs306/femanager) and in a CSV (source → Hungarian) as a starting reference for the Crowdin editor.