feat(ocr): let a preset read several languages

docs/ENGINES.md

@@ -1877,6 +1877,14 @@ format, and FFmpeg reads what the file holds, so a `.dat` with no video in it fa
 scans and pictures with Tesseract (`Ocr/TesseractConverter.cs`), in the language the preset names
 (`PdfOptions.OcrLanguage`, a Tesseract code; English by default). The built-in "Searchable PDF" preset turns it on.
 
+Text that mixes languages (issue #1123) has several codes in that one setting, the main language first, joined with
+`+` as Tesseract's `-l` takes them (`chi_sim+eng`). `OcrLanguages.Parse` is the only reader: a code not in the list is
+left out, repeats count once, and with none left English is read. Settings from before this hold one code and read as
+they always did; an older Filee reads a joined value as a code it doesn't know, so English. Each language is its own
+download and is fetched before the file is read; a download that fails refuses the file and names that language. Every
+language makes Tesseract slower (it tries the others on words the first one reads badly), so the editor's "Other
+languages in the text" says to add only what the text has.
+
 - The route planner puts an OCR edge first (`ConversionEdge.Ocr`, `RoutePlanner.Plan(ocr: true)`): picture or PDF →
   searchable PDF, then the cheapest ordinary route from that PDF. A picture Tesseract can't open (HEIC, PSD, …)
   becomes a PNG first. OCR edges are never part of an ordinary route.
@@ -1905,12 +1913,14 @@ level and the newest revision the Mac has), part of macOS, so nothing is downloa
 Tesseract and is registered before it, so the route planner takes it; on Windows and Linux it is unavailable
 ("Not available on this platform").
 
-- The preset's language (a Tesseract code) is mapped to Vision's identifiers (`VisionLanguages`) and asked for with
-  English next to it; if Vision refuses the pair it reads with the language alone. Which languages Vision reads comes
+- The preset's languages (Tesseract codes) are mapped to Vision's identifiers (`VisionLanguages`) and asked for in their
+  order. English is added when it wasn't chosen and goes last unless it is the main language; if Vision refuses the
+  combination it reads with one language fewer, down to the main language alone. Which languages Vision reads comes
   from the Mac itself (`supportedRecognitionLanguagesAndReturnError:`, more with newer macOS versions); a language it
-  doesn't read (Hindi, Nepali, Greek, …) goes to Tesseract when that is installed, and is refused otherwise with
-  "Apple Vision can't read this language. Install Tesseract …". The preset editor shows no download size for the
-  languages Vision reads, and its hint names Apple Vision.
+  doesn't read (Hindi, Nepali, Greek, …) goes to Tesseract when that is installed, together with the preset's other
+  languages, and is refused otherwise with "Apple Vision can't read this language. Install Tesseract …" and its name.
+  The preset editor shows no download size for the languages Vision reads, unless such a language among the chosen ones
+  sends them all to Tesseract, and its hint names Apple Vision.
 - PDFs go page by page exactly like Tesseract's (`TesseractConverter.RecognizePdfAsync`, at most two pages at a time).
   A JPEG picture goes into the PDF as it is, other pictures (and a JPEG that EXIF turns) as an upright PNG; every page
   of a TIFF becomes a page. The page size comes from the picture's resolution, 300 dpi when it has none.

src/Filee.App/Assets/i18n/ar.json

@@ -905,6 +905,10 @@
   "presets.ocr_hint_macos": "يصبح نص المستندات الممسوحة والصور قابلًا للبحث والتحرير بأداة التعرّف على النص المدمجة في macOS (Apple Vision). اللغات التي لا تقرؤها تتطلب Tesseract (الإعدادات ← المحركات).\nتبقى الصفحات التي تحتوي على نص كما هي.",
   "presets.ocr_language": "لغة النص",
   "presets.ocr_language_size": "تنزيل {0}",
+  "presets.ocr_more_languages": "لغات أخرى في النص",
+  "presets.ocr_add_language": "إضافة لغة",
+  "presets.ocr_remove_language": "إزالة هذه اللغة",
+  "presets.ocr_languages_hint": "أضف فقط اللغات الموجودة فعلًا في النص، فكل لغة تجعل التعرّف أبطأ.",
   "presets.pdf_keep_metadata": "الاحتفاظ بالبيانات الوصفية للصفحات والصور (XMP)",
   "presets.watermark": "علامة مائية",
   "presets.watermark_hint": "مثلًا: مسودة",

src/Filee.App/Assets/i18n/de.json

@@ -905,6 +905,10 @@
   "presets.ocr_hint_macos": "Scans und Bilder erhalten durchsuchbaren und bearbeitbaren Text mit der Texterkennung von macOS (Apple Vision). Nicht unterstützte Sprachen benötigen Tesseract (Einstellungen → Module).\nSeiten, die bereits Text enthalten, bleiben unverändert.",
   "presets.ocr_language": "Sprache des Textes",
   "presets.ocr_language_size": "{0} Download",
+  "presets.ocr_more_languages": "Weitere Sprachen im Text",
+  "presets.ocr_add_language": "Sprache hinzufügen",
+  "presets.ocr_remove_language": "Diese Sprache entfernen",
+  "presets.ocr_languages_hint": "Füge nur Sprachen hinzu, die wirklich im Text vorkommen: Jede weitere macht die Erkennung langsamer.",
   "presets.pdf_keep_metadata": "Seiten- und Bildmetadaten beibehalten (XMP)",
   "presets.watermark": "Wasserzeichen",
   "presets.watermark_hint": "z. B. ENTWURF",

src/Filee.App/Assets/i18n/en.json

@@ -920,6 +920,10 @@
   "presets.ocr_hint_macos": "Scans and pictures get text you can search and edit, with macOS's own text recognition (Apple Vision). Languages it can't read need Tesseract (Settings → Engines).\nPages that already have text stay as they are.",
   "presets.ocr_language": "Language of the text",
   "presets.ocr_language_size": "{0} download",
+  "presets.ocr_more_languages": "Other languages in the text",
+  "presets.ocr_add_language": "Add a language",
+  "presets.ocr_remove_language": "Remove this language",
+  "presets.ocr_languages_hint": "Only add languages the text really has: each one makes recognition slower.",
   "presets.pdf_keep_metadata": "Keep page and picture metadata (XMP)",
   "presets.watermark": "Watermark",
   "presets.watermark_hint": "e.g. DRAFT",

src/Filee.App/Assets/i18n/es.json

@@ -905,6 +905,10 @@
   "presets.ocr_hint_macos": "Los escaneos e imágenes tendrán texto que se puede buscar y editar, con el reconocimiento de texto propio de macOS (Apple Vision). Los idiomas que no lee requieren Tesseract (Ajustes → Motores).\nLas páginas que ya tienen texto no cambian.",
   "presets.ocr_language": "Idioma del texto",
   "presets.ocr_language_size": "Descarga de {0}",
+  "presets.ocr_more_languages": "Otros idiomas del texto",
+  "presets.ocr_add_language": "Añadir un idioma",
+  "presets.ocr_remove_language": "Quitar este idioma",
+  "presets.ocr_languages_hint": "Añade solo los idiomas que de verdad tiene el texto: cada uno hace más lento el reconocimiento.",
   "presets.pdf_keep_metadata": "Conservar metadatos de página e imagen (XMP)",
   "presets.watermark": "Marca de agua",
   "presets.watermark_hint": "p. ej., BORRADOR",

src/Filee.App/Assets/i18n/fr.json

@@ -920,6 +920,10 @@
   "presets.ocr_hint_macos": "Le texte des numérisations et des images devient consultable et modifiable grâce à la reconnaissance de texte intégrée à macOS (Apple Vision). Les langues qu'elle ne lit pas nécessitent Tesseract (Paramètres → Moteurs).\nLes pages qui ont déjà du texte restent telles quelles.",
   "presets.ocr_language": "Langue du texte",
   "presets.ocr_language_size": "Téléchargement de {0}",
+  "presets.ocr_more_languages": "Autres langues du texte",
+  "presets.ocr_add_language": "Ajouter une langue",
+  "presets.ocr_remove_language": "Retirer cette langue",
+  "presets.ocr_languages_hint": "N'ajoutez que les langues vraiment présentes dans le texte : chacune ralentit la reconnaissance.",
   "presets.pdf_keep_metadata": "Conserver les métadonnées des pages et des images (XMP)",
   "presets.watermark": "Filigrane",
   "presets.watermark_hint": "p. ex. BROUILLON",

src/Filee.App/Assets/i18n/hi.json

@@ -905,6 +905,10 @@
   "presets.ocr_hint_macos": "macOS की अपनी टेक्स्ट पहचान (Apple Vision) से स्कैन और तस्वीरों का टेक्स्ट खोजने और बदलने योग्य बनता है। जो भाषाएँ यह नहीं पढ़ सकता, उनके लिए Tesseract चाहिए (सेटिंग्स → इंजन)।\nजिन पेजों में पहले से टेक्स्ट है वे वैसे ही रहते हैं।",
   "presets.ocr_language": "टेक्स्ट की भाषा",
   "presets.ocr_language_size": "{0} डाउनलोड",
+  "presets.ocr_more_languages": "टेक्स्ट की अन्य भाषाएँ",
+  "presets.ocr_add_language": "भाषा जोड़ें",
+  "presets.ocr_remove_language": "यह भाषा हटाएँ",
+  "presets.ocr_languages_hint": "सिर्फ़ वही भाषाएँ जोड़ें जो टेक्स्ट में सच में हैं: हर भाषा से पहचान धीमी होती है।",
   "presets.pdf_keep_metadata": "पेज और तस्वीर का मेटाडेटा (XMP) रखें",
   "presets.watermark": "वॉटरमार्क",
   "presets.watermark_hint": "जैसे: ड्राफ्ट",

src/Filee.App/Assets/i18n/id.json

@@ -905,6 +905,10 @@
   "presets.ocr_hint_macos": "Hasil pindai dan gambar mendapatkan teks yang dapat dicari dan disalin dengan pengenal teks bawaan macOS (Apple Vision). Bahasa yang tidak didukungnya memerlukan Tesseract (Pengaturan → Engine).\nHalaman yang sudah memiliki teks dibiarkan apa adanya.",
   "presets.ocr_language": "Bahasa teks",
   "presets.ocr_language_size": "Unduhan {0}",
+  "presets.ocr_more_languages": "Bahasa lain dalam teks",
+  "presets.ocr_add_language": "Tambah bahasa",
+  "presets.ocr_remove_language": "Hapus bahasa ini",
+  "presets.ocr_languages_hint": "Tambahkan hanya bahasa yang benar-benar ada dalam teks: setiap bahasa membuat pengenalan lebih lambat.",
   "presets.pdf_keep_metadata": "Pertahankan metadata halaman dan gambar (XMP)",
   "presets.watermark": "Tanda air (watermark)",
   "presets.watermark_hint": "contoh: DRAF",

src/Filee.App/Assets/i18n/it.json

@@ -904,6 +904,10 @@
 "presets.ocr_hint_macos": "Scansioni e immagini ottengono testo ricercabile e modificabile, con il riconoscimento testo di macOS (Apple Vision). Le lingue che non riesce a leggere richiedono Tesseract (Impostazioni → Motori).\nLe pagine che hanno già testo restano come sono.",
 "presets.ocr_language": "Lingua del testo",
 "presets.ocr_language_size": "Download di {0}",
+"presets.ocr_more_languages": "Altre lingue nel testo",
+"presets.ocr_add_language": "Aggiungi una lingua",
+"presets.ocr_remove_language": "Rimuovi questa lingua",
+"presets.ocr_languages_hint": "Aggiungi solo le lingue davvero presenti nel testo: ognuna rallenta il riconoscimento.",
 "presets.pdf_keep_metadata": "Mantieni i metadati di pagine e immagini (XMP)",
 "presets.watermark": "Filigrana",
 "presets.watermark_hint": "ad es. BOZZA",

src/Filee.App/Assets/i18n/ja.json

@@ -905,6 +905,10 @@
   "presets.ocr_hint_macos": "スキャンや画像の文字を、macOS 標準の文字認識（Apple Vision）で検索・編集できるようにします。読めない言語には Tesseract が必要です（「設定」→「変換エンジン」）。\nすでにテキストがあるページはそのままです。",
   "presets.ocr_language": "テキストの言語",
   "presets.ocr_language_size": "{0} をダウンロード",
+  "presets.ocr_more_languages": "テキストに含まれる他の言語",
+  "presets.ocr_add_language": "言語を追加",
+  "presets.ocr_remove_language": "この言語を削除",
+  "presets.ocr_languages_hint": "テキストに実際に含まれる言語だけを追加してください。言語が増えるほど認識に時間がかかります。",
   "presets.pdf_keep_metadata": "ページと画像のメタデータ（XMP）を保持",
   "presets.watermark": "透かし",
   "presets.watermark_hint": "例：下書き",

src/Filee.App/Assets/i18n/ko.json

@@ -920,6 +920,10 @@
   "presets.ocr_hint_macos": "스캔본과 사진의 글자를 macOS에 들어 있는 문자 인식(Apple Vision)으로 검색하고 편집할 수 있게 돼요. Apple Vision이 못 읽는 언어는 Tesseract가 필요해요(설정 → 변환 엔진).\n이미 텍스트가 있는 페이지는 그대로 둬요.",
   "presets.ocr_language": "텍스트 언어",
   "presets.ocr_language_size": "{0} 내려받기",
+  "presets.ocr_more_languages": "텍스트에 함께 있는 다른 언어",
+  "presets.ocr_add_language": "언어 추가",
+  "presets.ocr_remove_language": "이 언어 빼기",
+  "presets.ocr_languages_hint": "텍스트에 실제로 있는 언어만 추가해 주세요. 언어가 많을수록 인식이 느려져요.",
   "presets.pdf_keep_metadata": "페이지·이미지 메타데이터(XMP) 유지",
   "presets.watermark": "워터마크",
   "presets.watermark_hint": "예: 초안",

src/Filee.App/Assets/i18n/ne.json

@@ -905,6 +905,10 @@
   "presets.ocr_hint_macos": "macOS को आफ्नै पाठ पहिचान (Apple Vision) ले स्क्यान र तस्बिरको पाठ खोज्न र सम्पादन गर्न मिल्ने हुन्छ। यसले पढ्न नसक्ने भाषाका लागि Tesseract चाहिन्छ (सेटिङहरू → इन्जिनहरू)।\nपहिले नै पाठ भएका पृष्ठ जस्ताको तस्तै रहन्छन्।",
   "presets.ocr_language": "पाठको भाषा",
   "presets.ocr_language_size": "{0} डाउनलोड",
+  "presets.ocr_more_languages": "पाठका अन्य भाषाहरू",
+  "presets.ocr_add_language": "भाषा थप्नुहोस्",
+  "presets.ocr_remove_language": "यो भाषा हटाउनुहोस्",
+  "presets.ocr_languages_hint": "पाठमा साँच्चै भएका भाषा मात्र थप्नुहोस्: हरेक भाषाले पहिचान ढिलो बनाउँछ।",
   "presets.pdf_keep_metadata": "पृष्ठ र तस्बिरको मेटाडाटा (XMP) राख्नुहोस्",
   "presets.watermark": "वाटरमार्क",
   "presets.watermark_hint": "जस्तै: मस्यौदा",

src/Filee.App/Assets/i18n/pl.json

@@ -920,6 +920,10 @@
   "presets.ocr_hint_macos": "Tekst skanów i obrazów da się przeszukiwać i edytować dzięki wbudowanemu rozpoznawaniu tekstu macOS (Apple Vision). Języki, których nie czyta, wymagają Tesseract (Ustawienia → Silniki).\nStrony, które mają już tekst, pozostają bez zmian.",
   "presets.ocr_language": "Język tekstu",
   "presets.ocr_language_size": "Pobieranie {0}",
+  "presets.ocr_more_languages": "Inne języki w tekście",
+  "presets.ocr_add_language": "Dodaj język",
+  "presets.ocr_remove_language": "Usuń ten język",
+  "presets.ocr_languages_hint": "Dodawaj tylko języki, które naprawdę są w tekście: każdy kolejny spowalnia rozpoznawanie.",
   "presets.pdf_keep_metadata": "Zachowaj metadane stron i obrazów (XMP)",
   "presets.watermark": "Znak wodny",
   "presets.watermark_hint": "np. SZKIC",

src/Filee.App/Assets/i18n/pt-BR.json

@@ -920,6 +920,10 @@
   "presets.ocr_hint_macos": "Digitalizações e imagens ganham texto que pode ser pesquisado e editado, com o reconhecimento de texto do próprio macOS (Apple Vision). Idiomas que ele não lê precisam do Tesseract (Configurações → Motores).\nPáginas que já têm texto ficam como estão.",
   "presets.ocr_language": "Idioma do texto",
   "presets.ocr_language_size": "Download de {0}",
+  "presets.ocr_more_languages": "Outros idiomas no texto",
+  "presets.ocr_add_language": "Adicionar um idioma",
+  "presets.ocr_remove_language": "Remover este idioma",
+  "presets.ocr_languages_hint": "Adicione só os idiomas que o texto realmente tem: cada um deixa o reconhecimento mais lento.",
   "presets.pdf_keep_metadata": "Manter metadados de página e imagem (XMP)",
   "presets.watermark": "Marca d'água",
   "presets.watermark_hint": "ex.: RASCUNHO",

src/Filee.App/Assets/i18n/pt-PT.json

@@ -920,6 +920,10 @@
   "presets.ocr_hint_macos": "As digitalizações e imagens passam a ter texto que podes pesquisar e editar, com o reconhecimento de texto do macOS (Apple Vision). Os idiomas que não consegue ler requerem o Tesseract (Definições → Motores).\nAs páginas que já têm texto mantêm-se.",
   "presets.ocr_language": "Idioma do texto",
   "presets.ocr_language_size": "Transferência de {0}",
+  "presets.ocr_more_languages": "Outros idiomas no texto",
+  "presets.ocr_add_language": "Adicionar um idioma",
+  "presets.ocr_remove_language": "Remover este idioma",
+  "presets.ocr_languages_hint": "Adiciona só os idiomas que o texto tem mesmo: cada um torna o reconhecimento mais lento.",
   "presets.pdf_keep_metadata": "Manter metadados de páginas e imagens (XMP)",
   "presets.watermark": "Marca de água",
   "presets.watermark_hint": "Por exemplo, RASCUNHO",

src/Filee.App/Assets/i18n/ru.json

@@ -920,6 +920,10 @@
   "presets.ocr_hint_macos": "Текст сканов и изображений можно будет искать и редактировать с помощью встроенного в macOS распознавания текста (Apple Vision). Для языков, которые оно не читает, нужен Tesseract (Настройки → Движки).\nСтраницы, где уже есть текст, не меняются.",
   "presets.ocr_language": "Язык текста",
   "presets.ocr_language_size": "Загрузка {0}",
+  "presets.ocr_more_languages": "Другие языки в тексте",
+  "presets.ocr_add_language": "Добавить язык",
+  "presets.ocr_remove_language": "Убрать этот язык",
+  "presets.ocr_languages_hint": "Добавляйте только языки, которые действительно есть в тексте: каждый новый замедляет распознавание.",
   "presets.pdf_keep_metadata": "Сохранять метаданные страниц и картинок (XMP)",
   "presets.watermark": "Водяной знак",
   "presets.watermark_hint": "например, ЧЕРНОВИК",

src/Filee.App/Assets/i18n/th.json

@@ -905,6 +905,10 @@
   "presets.ocr_hint_macos": "ข้อความในภาพสแกนและรูปภาพจะค้นหาและแก้ไขได้ด้วยระบบรู้จำข้อความในตัวของ macOS (Apple Vision) ภาษาที่อ่านไม่ได้ต้องใช้ Tesseract (การตั้งค่า → เครื่องมือแปลงไฟล์)\nหน้าที่มีข้อความอยู่แล้วจะคงไว้ตามเดิม",
   "presets.ocr_language": "ภาษาของข้อความ",
   "presets.ocr_language_size": "ดาวน์โหลด {0}",
+  "presets.ocr_more_languages": "ภาษาอื่นในข้อความ",
+  "presets.ocr_add_language": "เพิ่มภาษา",
+  "presets.ocr_remove_language": "เอาภาษานี้ออก",
+  "presets.ocr_languages_hint": "เพิ่มเฉพาะภาษาที่มีอยู่ในข้อความจริง ๆ เพราะทุกภาษาที่เพิ่มจะทำให้การรู้จำช้าลง",
   "presets.pdf_keep_metadata": "คงเมทาดาตาของหน้าและรูปภาพ (XMP)",
   "presets.watermark": "ลายน้ำ",
   "presets.watermark_hint": "เช่น ฉบับร่าง",