🌐 Sync Translations + Update README Progress Table (#3862)

### 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>

stirling-pdf/src/main/resources/messages_cs_CZ.properties

@@ -170,6 +170,67 @@ sizes.medium=Střední
 sizes.large=Velké
 sizes.x-large=Extra velké
 error.pdfPassword=PDF dokument je chráněn heslem a buď heslo nebylo zadáno, nebo bylo nesprávné
+error.pdfCorrupted=PDF file appears to be corrupted or damaged. Please try using the 'Repair PDF' feature first to fix the file before proceeding with this operation.
+error.pdfCorruptedMultiple=One or more PDF files appear to be corrupted or damaged. Please try using the 'Repair PDF' feature on each file first before attempting to merge them.
+error.pdfCorruptedDuring=Error {0}: PDF file appears to be corrupted or damaged. Please try using the 'Repair PDF' feature first to fix the file before proceeding with this operation.
+
+# Frontend corruption error messages
+error.pdfInvalid=The PDF file "{0}" appears to be corrupted or has an invalid structure. Please try using the 'Repair PDF' feature to fix the file before proceeding.
+error.tryRepair=Try using the Repair PDF feature to fix corrupted files.
+
+# Additional error messages
+error.pdfEncryption=The PDF appears to have corrupted encryption data. This can happen when the PDF was created with incompatible encryption methods. Please try using the 'Repair PDF' feature first, or contact the document creator for a new copy.
+error.fileProcessing=An error occurred while processing the file during {0} operation: {1}
+
+# Generic error message templates
+error.toolNotInstalled={0} is not installed
+error.toolRequired={0} is required for {1}
+error.conversionFailed={0} conversion failed
+error.commandFailed={0} command failed
+error.algorithmNotAvailable={0} algorithm not available
+error.optionsNotSpecified={0} options are not specified
+error.fileFormatRequired=File must be in {0} format
+error.invalidFormat=Invalid {0} format: {1}
+error.endpointDisabled=This endpoint has been disabled by the admin
+error.urlNotReachable=URL is not reachable, please provide a valid URL
+
+# DPI and image rendering messages - used by frontend for dynamic translation
+# Backend sends: [TRANSLATE:messageKey:arg1,arg2] English message
+# Frontend parses this and replaces with localized versions using these keys
+error.dpiExceedsLimit=DPI value {0} exceeds maximum safe limit of {1}. High DPI values can cause memory issues and crashes. Please use a lower DPI value.
+error.pageTooBigForDpi=PDF page {0} is too large to render at {1} DPI. Please try a lower DPI value (recommended: 150 or less).
+error.pageTooBigExceedsArray=PDF page {0} is too large to render at {1} DPI. The resulting image would exceed Java's maximum array size. Please try a lower DPI value (recommended: 150 or less).
+error.pageTooBigFor300Dpi=PDF page {0} is too large to render at 300 DPI. The resulting image would exceed Java's maximum array size. Please use a lower DPI value for PDF-to-image conversion.
+
+# URL and website conversion messages
+
+# System requirements messages
+
+# Authentication and security messages
+error.apiKeyInvalid=API key is not valid.
+error.userNotFound=User not found.
+error.passwordRequired=Password must not be null.
+error.accountLocked=Your account has been locked due to too many failed login attempts.
+error.invalidEmail=Invalid email addresses provided.
+error.emailAttachmentRequired=An attachment is required to send the email.
+error.signatureNotFound=Signature file not found.
+
+# File processing messages
+error.fileNotFound=File not found with ID: {0}
+
+# Database and configuration messages
+error.noBackupScripts=No backup scripts were found.
+error.unsupportedProvider={0} is not currently supported.
+error.pathTraversalDetected=Path traversal detected for security reasons.
+
+# Validation messages
+error.invalidArgument=Invalid argument: {0}
+error.argumentRequired={0} must not be null
+error.operationFailed=Operation failed: {0}
+error.angleNotMultipleOf90=Angle must be a multiple of 90
+error.pdfBookmarksNotFound=No PDF bookmarks/outline found in document
+error.fontLoadingFailed=Error processing font file
+error.fontDirectoryReadFailed=Failed to read font directory
 delete=Smazat
 username=Uživatelské jméno
 password=Heslo