[Client] Show localized card names, texts and pictures (#7294)

* [Client] Show localized card names, texts and pictures

Localization wiring now runs end to end: the oracle importer collects
foreignData for the configured language and the client renders it.

- [Oracle] Import localized names and rules texts for the selected cardLang
  - single-face cards store their foreignData name and full text
  - multi-face (split/adventure/aftermath/prepare) cards collect the joined
    name once and join each face's translated text with the same separator
    as the English merge; an incomplete translation falls back to English;
    the joined text follows the same highest-priority-set policy as the
    single-face path and is only collected when localization is enabled
  - the wizard switching languages re-imports the card database

- [Client] Display localized card info throughout the client
  - card info text/picture widgets and the game board re-render on language
    change
  - pictures resolve cardLang art through Scryfall's named endpoint using the
    localized name, falling back to id-based art when no match exists
  - deck editor keeps canonical English names as card identity (EditRole)
    while showing localized names (DisplayRole), so decks and wire names
    stay stable

- [Card] Add CardLocalization-backed name/text lookup and cards.xml v4
  localization elements with a bounded-size translation cache

- [Tests] Cover oracle foreignData import (incl. multi-face joins, priority
  and fallback paths), XML v4 localization parsing, deck model localized
  display and the language-aware settings default

Existing installations need to re-run Oracle to see translations: localized
data only lands in cards.xml when the Oracle app is started with the
preferred language selected — launch the separate "Oracle" program that
ships with Cockatrice, pick the language in the wizard and let it re-import
the card database.

The client's database cache (cards.xml.cache) is invalidated by the cache
format bump and the source-hash checks, but a cache written before the
re-import can still hold English-only entries (the hash uses file size and
mtime, so a same-size/same-timestamp rewrite may be served as-is); delete
cards.xml.cache and relaunch if no localized names/texts show up after
re-importing.

* [Card] Pass localized card names and texts into CardInfo construction

Address review: instead of constructing the card and then calling
setLocalizedName/setLocalizedText (which emit a cardInfoChanged signal per
language), both constructors, both newInstance overloads and their callers
(cards.xml v4 parser and the binary cache reader) now pass the localized maps
as constructor arguments.

* [Client] Rename LocalizedCard:: helpers namespace to CardLocalization

The namespace now matches its header file name, as the review pointed out;
LocalizedCard reads more like a class or struct. Callers (card info text
widget, board card name rendering) are updated to match.

* [Client] Drop unused info member from the card info text widget

The CardInfoPtr member was only ever initialized to nullptr and never read;
remove it together with its initializer.

* [PictureLoader] Add the localized picture URL explicitly, not implicitly

Address review: silently prepending the Scryfall named-picture URL to the
download list whenever a non-English card language was active was surprising,
consumed quota per card when it failed, and could grab the wrong (canon) art on
name collisions, with no way to turn it off.

The insert is now opt-in and user-controlled: changing the card language adds
the template to the top of the download URLs once (persisted, documented in the
re-import prompt, and editable/removable in the deck editor settings), while the
picture loader no longer injects it at request time.

* [Card] Show card languages in the same native (English) format as the UI

Address review: the card text & images language dropdown listed bare native
names, some in inconsistent lowercase (e.g. "čeština", "español de España"),
which makes the languages easy to mix up for users that do not read the script
(e.g. 日本語 vs 한국어). It now mirrors the UI language dropdown and always pairs
the native name with its English name (e.g. "Deutsch (German)",
"日本語 (Japanese)"), using the same fixed casing.

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

oracle/src/oracleimporter.h

@@ -107,7 +107,8 @@ public:
     SplitCardPart(const QString &_name,
                   const QString &_text,
                   const QHash<QString, QString> &_properties,
-                  const PrintingInfo &_printingInfo);
+                  const PrintingInfo &_printingInfo,
+                  const QString &_localizedText = QString());
     inline const QString &getName() const
     {
         return name;
@@ -116,6 +117,13 @@ public:
     {
         return text;
     }
+    /**
+     * @brief The cardLang rules text of this face's foreignData entry, if any.
+     */
+    inline const QString &getLocalizedText() const
+    {
+        return localizedText;
+    }
     inline const QHash<QString, QString> &getProperties() const
     {
         return properties;
@@ -128,10 +136,18 @@ public:
 private:
     QString name;
     QString text;
+    QString localizedText;
     QHash<QString, QString> properties;
     PrintingInfo printingInfo;
 };
 
+struct LocalizedCardEntry
+{
+    QString name;
+    QString text;
+    CardSet::Priority priority = CardSet::PriorityLowest;
+};
+
 class OracleImporter : public QObject
 {
     Q_OBJECT
@@ -171,12 +187,53 @@ private:
      */
     QAtomicInt importCancelled;
 
+    /**
+     * The ISO-639 language code whose foreignData is imported; "en" by default.
+     */
+    QString cardLang = "en";
+
+    /**
+     * Whether cardLang is a supported language other than English, so per-card
+     * foreignData scanning can be skipped entirely when disabled.
+     */
+    bool localizationEnabled = false;
+
+    /**
+     * Localized name/text collected per imported card key while parsing sets,
+     * applied to the CardInfo objects by applyLocalizedData() once all
+     * printings have been seen so the best-priority one wins.
+     */
+    QMap<QString, LocalizedCardEntry> localizedEntries;
+
+    /**
+     * cardLang rules text collected for split-card names while parsing sets,
+     * applied by applyLocalizedData(). Kept apart from localizedEntries because
+     * MTGJSON emits each split face as its own card object with the joined name
+     * on every foreignData entry: names and the per-face text join have different
+     * completeness and must not overwrite each other under the same key.
+     */
+    QMap<QString, LocalizedCardEntry> splitLocalizedTexts;
+
     CardInfoPtr addCard(QString name,
                         const QString &text,
                         bool isToken,
                         QHash<QString, QString> properties,
                         const QList<CardRelation *> &relatedCards,
                         const PrintingInfo &printingInfo);
+
+    /**
+     * Records the first foreignData entry matching cardLang for the given card
+     * key, keeping the entry from the highest-priority set seen so far.
+     *
+     * Multi-face cards (split, adventure, aftermath, prepare) pass collectText =
+     * false: MTGJSON emits one foreignData entry per face with the same joined
+     * name but only that face's text, so the name is collected here while the
+     * per-face texts are joined during the split-card merge.
+     */
+    void collectForeignData(const QString &cardKey,
+                            const CardSetPtr &currentSet,
+                            const QJsonObject &card,
+                            bool collectText = true);
 signals:
     void setIndexChanged(int cardsImported, int setIndex, const QString &setName);
     void dataReadProgress(int bytesRead, int totalBytes);
@@ -195,6 +252,15 @@ public:
     {
         progressReporting = enabled;
     }
+    /**
+     * Selects the ISO-639 language code whose foreignData is imported.
+     * English (the default) and unsupported codes disable localization.
+     */
+    void setCardLang(const QString &lang);
+    const QString &getCardLang() const
+    {
+        return cardLang;
+    }
     /**
      * Scans the given JSON document for set metadata. Takes the data by value so
      * the wizard can hand over its decompressed buffer without copying it.
@@ -212,6 +278,12 @@ public:
     {
         importCancelled.storeRelease(1);
     }
+    /**
+     * Applies the collected localized names/texts to the imported cards.
+     * Called automatically at the end of startImport(); exposed separately so
+     * tests can drive it after importing sets directly.
+     */
+    void applyLocalizedData();
     bool saveToFile(const QString &fileName, const QString &sourceUrl, const QString &sourceVersion);
     int importCardsFromSet(const CardSetPtr &currentSet, const QJsonArray &cardsList);
     /**