edz: make EdzArchive error strings translatable (+ DE/FR)

The six user-facing error strings in EdzArchive::extract() were hard-coded
QStringLiteral, so they could not be translated (reported by plc-user in
PR #513).

Wrap them in tr() via Q_DECLARE_TR_FUNCTIONS — EdzArchive is not a QObject,
so this gives it its own translation context without pulling in a moc
dependency. The *.part.xml glob stays a QStringLiteral: it is a filename
pattern, not user-facing text.

Adds German and French translations for all six. German wording for
"Cannot read %1" is plc-user's ("Kann %1 nicht lesen.").

Note for review: the rest of QET uses French source strings translated to
en/de in the .ts files, whereas these strings are English in the source
(as merged in PR #513). This commit keeps them English rather than
rewriting strings already reviewed; happy to flip them to French sources
for consistency if preferred.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lang/qet_de.ts

@@ -15343,4 +15343,37 @@ Maximale Länge: %2px
         <translation>Was:</translation>
     </message>
 </context>
+<context>
+    <name>EdzArchive</name>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="41"/>
+        <source>File not found: %1</source>
+        <translation>Datei nicht gefunden: %1</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="50"/>
+        <source>Cannot read %1</source>
+        <translation>Kann %1 nicht lesen.</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="58"/>
+        <source>This .edz is a zip-format package, which is not yet supported (only 7-Zip .edz files can be imported).</source>
+        <translation>Diese .edz-Datei ist ein Paket im ZIP-Format, das noch nicht unterstützt wird (es können nur .edz-Dateien im 7-Zip-Format importiert werden).</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="62"/>
+        <source>Not a valid .edz package (unrecognised archive format).</source>
+        <translation>Kein gültiges .edz-Paket (unbekanntes Archivformat).</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="70"/>
+        <source>Could not create a temporary directory: %1</source>
+        <translation>Temporäres Verzeichnis konnte nicht erstellt werden: %1</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="80"/>
+        <source>No *.part.xml found inside the .edz</source>
+        <translation>Keine *.part.xml in der .edz-Datei gefunden</translation>
+    </message>
+</context>
 </TS>

lang/qet_fr.ts

@@ -15181,4 +15181,37 @@ Longueur maximale : %2px
         <translation></translation>
     </message>
 </context>
+<context>
+    <name>EdzArchive</name>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="41"/>
+        <source>File not found: %1</source>
+        <translation>Fichier introuvable : %1</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="50"/>
+        <source>Cannot read %1</source>
+        <translation>Impossible de lire %1</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="58"/>
+        <source>This .edz is a zip-format package, which is not yet supported (only 7-Zip .edz files can be imported).</source>
+        <translation>Ce fichier .edz est un paquet au format zip, qui n&apos;est pas encore pris en charge (seuls les fichiers .edz au format 7-Zip peuvent être importés).</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="62"/>
+        <source>Not a valid .edz package (unrecognised archive format).</source>
+        <translation>Paquet .edz non valide (format d&apos;archive non reconnu).</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="70"/>
+        <source>Could not create a temporary directory: %1</source>
+        <translation>Impossible de créer un répertoire temporaire : %1</translation>
+    </message>
+    <message>
+        <location filename="../sources/import/edz/edzarchive.cpp" line="80"/>
+        <source>No *.part.xml found inside the .edz</source>
+        <translation>Aucun fichier *.part.xml trouvé dans le .edz</translation>
+    </message>
+</context>
 </TS>

sources/import/edz/edzarchive.cpp

@@ -38,7 +38,7 @@ bool EdzArchive::extract(const QString &edz_path)
 
 	const QFileInfo fi(edz_path);
 	if (!fi.exists() || !fi.isFile()) {
-		m_error = QStringLiteral("File not found: %1").arg(edz_path);
+		m_error = tr("File not found: %1").arg(edz_path);
 		return false;
 	}
 
@@ -47,7 +47,7 @@ bool EdzArchive::extract(const QString &edz_path)
 	// detect that up front and say so clearly rather than failing opaquely.
 	QFile probe(fi.absoluteFilePath());
 	if (!probe.open(QIODevice::ReadOnly)) {
-		m_error = QStringLiteral("Cannot read %1").arg(edz_path);
+		m_error = tr("Cannot read %1").arg(edz_path);
 		return false;
 	}
 	const QByteArray magic = probe.read(6);
@@ -55,11 +55,11 @@ bool EdzArchive::extract(const QString &edz_path)
 	static const QByteArray k7z("7z\xBC\xAF\x27\x1C", 6);
 	if (!magic.startsWith(k7z)) {
 		if (magic.startsWith(QByteArray("PK\x03\x04", 4))) {
-			m_error = QStringLiteral(
+			m_error = tr(
 				"This .edz is a zip-format package, which is not yet "
 				"supported (only 7-Zip .edz files can be imported).");
 		} else {
-			m_error = QStringLiteral(
+			m_error = tr(
 				"Not a valid .edz package (unrecognised archive format).");
 		}
 		return false;
@@ -67,7 +67,7 @@ bool EdzArchive::extract(const QString &edz_path)
 
 	m_dir.reset(new QTemporaryDir);
 	if (!m_dir->isValid()) {
-		m_error = QStringLiteral("Could not create a temporary directory: %1")
+		m_error = tr("Could not create a temporary directory: %1")
 				  .arg(m_dir->errorString());
 		return false;
 	}
@@ -77,7 +77,7 @@ bool EdzArchive::extract(const QString &edz_path)
 	}
 
 	if (partXmlPath().isEmpty()) {
-		m_error = QStringLiteral("No *.part.xml found inside the .edz");
+		m_error = tr("No *.part.xml found inside the .edz");
 		return false;
 	}
 	return true;

sources/import/edz/edzarchive.h

@@ -18,6 +18,7 @@
 #ifndef EDZARCHIVE_H
 #define EDZARCHIVE_H
 
+#include <QCoreApplication>
 #include <QString>
 #include <QScopedPointer>
 
@@ -38,6 +39,8 @@ class QTemporaryDir;
 */
 class EdzArchive
 {
+	Q_DECLARE_TR_FUNCTIONS(EdzArchive)
+
 	public:
 		EdzArchive();
 		~EdzArchive();