🌐 Sync Translations + Update README Progress Table (#3100)

### Description of Changes

This Pull Request was automatically generated to synchronize updates to
translation files and documentation. Below are the details of the
changes made:

#### **1. Synchronization of Translation Files**
- Updated translation files (`messages_*.properties`) to reflect changes
in the reference file `messages_en_GB.properties`.
- Ensured consistency and synchronization across all supported language
files.
- Highlighted any missing or incomplete translations.

#### **2. Update README.md**
- Generated the translation progress table in `README.md`.
- Added a summary of the current translation status for all supported
languages.
- Included up-to-date statistics on translation coverage.

#### **Why these changes are necessary**
- Keeps translation files aligned with the latest reference updates.
- Ensures the documentation reflects the current translation progress.

---

Auto-generated by [create-pull-request][1].

[1]: https://github.com/peter-evans/create-pull-request

Co-authored-by: stirlingbot[bot] <195170888+stirlingbot[bot]@users.noreply.github.com>

README.md

@@ -134,7 +134,7 @@ Stirling-PDF currently supports 39 languages!
 | Hungarian (Magyar) (hu_HU)                   | ![94%](https://geps.dev/progress/94)   |
 | Indonesian (Bahasa Indonesia) (id_ID)        | ![85%](https://geps.dev/progress/85)   |
 | Irish (Gaeilge) (ga_IE)                      | ![96%](https://geps.dev/progress/96)   |
-| Italian (Italiano) (it_IT)                   | ![98%](https://geps.dev/progress/98)   |
+| Italian (Italiano) (it_IT)                   | ![99%](https://geps.dev/progress/99)   |
 | Japanese (日本語) (ja_JP)                    | ![92%](https://geps.dev/progress/92)   |
 | Korean (한국어) (ko_KR)                      | ![97%](https://geps.dev/progress/97)   |
 | Norwegian (Norsk) (no_NB)                    | ![77%](https://geps.dev/progress/77)   |