Add missing language files and fix German translation typos

[Copilot]

This PR completes the language file support for the YRewrite Metainfo addon by adding 7 new language files and fixing issues in existing translations.

Changes

New Language Files

Added complete translations for the following languages:

• 🇫🇷 French (fr_fr.lang)
• 🇪🇸 Spanish (es_es.lang)
• 🇮🇹 Italian (it_it.lang)
• 🇳🇱 Dutch (nl_nl.lang)
• 🇧🇷 Portuguese/Brazil (pt_br.lang)
• 🇷🇺 Russian (ru_ru.lang)
• 🇸🇪 Swedish (sv_se.lang)

Completed English Translation

The en_gb.lang file was missing 11 translation keys, including:

• YForm table identifiers (rex_yrewrite_metainfo_icon_table, rex_yrewrite_metainfo_domain_table)
• Documentation menu entries (yrewrite_metainfo_docs and related keys)
• ZIP upload functionality labels and notices

Fixed German Translation Typos

Corrected two spelling errors in de_de.lang:

• "Meiden-Kategorie" → "Medien-Kategorie" (Media category)
• "autoamtisch" → "automatisch" (automatically)

Documentation Keys

Added 4 documentation section keys to all language files:

• yrewrite_metainfo_docs_intro - Introduction
• yrewrite_metainfo_docs_domain - Domain Meta-Infos
• yrewrite_metainfo_docs_icon_pwa - Icons and PWA
• yrewrite_metainfo_docs_fragments - Fragments

Updated Documentation

Updated README.md to reflect the expanded backend language support:

• Before: DE, EN (2 languages)
• After: DE, EN, FR, ES, IT, NL, PT, RU, SV (9 languages)

Quality Assurance

• ✅ All 9 language files contain exactly 44 translation keys
• ✅ All translation keys are consistent across all languages
• ✅ PHP syntax validation passed
• ✅ PHP CS Fixer validation passed (zero violations)
• ✅ Professional translations with proper grammar and spelling

Translation Sample

Example translation of yrewrite_metainfo_logo_notice across all languages:

• 🇩🇪 DE: "Logo, das im Template ausgegeben werden kann."
• 🇬🇧 EN: "Logo that can be output in the template."
• 🇫🇷 FR: "Logo qui peut être affiché dans le modèle."
• 🇪🇸 ES: "Logotipo que se puede mostrar en la plantilla."
• 🇮🇹 IT: "Logo che può essere visualizzato nel template."
• 🇳🇱 NL: "Logo dat in de sjabloon kan worden weergegeven."
• 🇧🇷 PT: "Logotipo que pode ser exibido no template."
• 🇷🇺 RU: "Логотип, который можно вывести в шаблоне."
• 🇸🇪 SV: "Logotyp som kan visas i mallen."

Closes #[issue_number]

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Ergänze fehlende Sprachen in /lang/ und führe eine Grammatik- und Rechtschreibprüfung durch</issue_title>
<issue_description>Es sollten im lang-Ordner Sprachdateien zu folgenden Sprachen vervollständigt werden

de_de.lang
en_gb.lang
fr_fr.lang
es_es.lang
it_it.lang
nl_nl.lang
pt_br.lang
ru_ru.lang
sv_se.lang
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

Fixes #42

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[Copilot]

Pull Request Overview

This PR adds comprehensive language support by completing missing language files and performing grammar checks. The purpose is to expand the YRewrite Metainfo addon's backend interface to support 9 languages instead of the previous 2, while also correcting existing grammatical errors.

• Added 7 new complete language files (French, Spanish, Italian, Dutch, Portuguese, Russian, Swedish)
• Completed the English language file with missing translation keys
• Fixed spelling errors in the German base language file

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lang/de_de.lang	Fixed typos: "autoamtisch" → "automatisch" and "Meiden" → "Medien", added documentation keys
lang/en_gb.lang	Added missing translation keys for docs tab, YForm table labels, ZIP upload functionality, and documentation sections
lang/es_es.lang	Complete Spanish translation file with all 44 translation keys
lang/fr_fr.lang	Complete French translation file with all 44 translation keys
lang/it_it.lang	Complete Italian translation file with all 44 translation keys
lang/nl_nl.lang	Complete Dutch translation file with all 44 translation keys
lang/pt_br.lang	Complete Brazilian Portuguese translation file with all 44 translation keys
lang/ru_ru.lang	Complete Russian translation file with all 44 translation keys
lang/sv_se.lang	Complete Swedish translation file with all 44 translation keys