fix(i18n): use translation keys for upload notification titles

Replace hardcoded English/Spanish strings with proper i18n translations
for upload notification titles and file count labels.

- Add upload.files translation key to all locale files
- Update notifications.js to use window.i18n.t() for:
  - upload.uploading title
  - upload.files file count label
  - upload.complete completion message

Fixes #108

static/locales/ar.json

@@ -27,6 +27,7 @@
     "upload_folder": "رفع مجلد",
     "upload.uploading": "جارٍ الرفع...",
     "upload.complete": "{count} / {total} تم رفعها",
+    "upload.files": "ملفات",
     "rename": "إعادة التسمية",
     "move": "نقل إلى...",
     "move_to": "نقل إلى",

static/locales/de.json

@@ -27,6 +27,7 @@
     "upload_folder": "Ordner hochladen",
     "upload.uploading": "Wird hochgeladen...",
     "upload.complete": "{count} / {total} hochgeladen",
+    "upload.files": "Dateien",
     "rename": "Umbenennen",
     "move": "Verschieben nach...",
     "move_to": "Verschieben nach",

static/locales/en.json

@@ -27,6 +27,7 @@
     "upload_folder": "Upload folder",
     "upload.uploading": "Uploading...",
     "upload.complete": "{count} / {total} uploaded",
+    "upload.files": "files",
     "rename": "Rename",
     "move": "Move to...",
     "move_to": "Move to",

static/locales/es.json

@@ -146,6 +146,7 @@
     "upload_folder": "Subir carpeta",
     "upload.uploading": "Subiendo...",
     "upload.complete": "{count} / {total} subidos",
+    "upload.files": "archivos",
     "rename": "Renombrar",
     "move": "Mover a...",
     "move_to": "Mover a",

static/locales/fa.json

@@ -27,6 +27,7 @@
     "upload_folder": "بارگذاری پوشه",
     "upload.uploading": "...در حال بارگذاری",
     "upload.complete": "{count} / {total} بارگذاری شد",
+    "upload.files": "فایل‌ها",
     "rename": "تغییر نام",
     "move": "انتقال به...",
     "move_to": "انتقال به",

static/locales/fr.json

@@ -27,6 +27,7 @@
     "upload_folder": "Téléverser un dossier",
     "upload.uploading": "Envoi en cours...",
     "upload.complete": "{count} / {total} envoyés",
+    "upload.files": "fichiers",
     "rename": "Renommer",
     "move": "Déplacer vers...",
     "move_to": "Déplacer vers",

static/locales/hi.json

@@ -27,6 +27,7 @@
     "upload_folder": "फ़ोल्डर अपलोड करें",
     "upload.uploading": "अपलोड हो रहा है...",
     "upload.complete": "{count} / {total} अपलोड हुईं",
+    "upload.files": "फ़ाइलें",
     "rename": "नाम बदलें",
     "move": "यहाँ ले जाएँ...",
     "move_to": "यहाँ ले जाएँ",

static/locales/it.json

@@ -27,6 +27,7 @@
     "upload_folder": "Carica cartella",
     "upload.uploading": "Caricamento...",
     "upload.complete": "{count} / {total} caricati",
+    "upload.files": "file",
     "rename": "Rinomina",
     "move": "Sposta in...",
     "move_to": "Sposta in",

static/locales/ja.json

@@ -27,6 +27,7 @@
     "upload_folder": "フォルダをアップロード",
     "upload.uploading": "アップロード中...",
     "upload.complete": "{count} / {total} アップロード完了",
+    "upload.files": "ファイル",
     "rename": "名前を変更",
     "move": "移動先...",
     "move_to": "移動先",

static/locales/ko.json

@@ -27,6 +27,7 @@
     "upload_folder": "폴더 업로드",
     "upload.uploading": "업로드 중...",
     "upload.complete": "{count} / {total} 업로드 완료",
+    "upload.files": "파일",
     "rename": "이름 변경",
     "move": "이동...",
     "move_to": "이동 대상",

static/locales/nl.json

@@ -27,6 +27,7 @@
     "upload_folder": "Map uploaden",
     "upload.uploading": "Uploaden...",
     "upload.complete": "{count} / {total} geüpload",
+    "upload.files": "bestanden",
     "rename": "Hernoemen",
     "move": "Verplaatsen naar...",
     "move_to": "Verplaatsen naar",

static/locales/pt.json

@@ -27,6 +27,7 @@
     "upload_folder": "Enviar pasta",
     "upload.uploading": "Enviando...",
     "upload.complete": "{count} / {total} enviados",
+    "upload.files": "arquivos",
     "rename": "Renomear",
     "move": "Mover para...",
     "move_to": "Mover para",

static/locales/ru.json

@@ -27,6 +27,7 @@
     "upload_folder": "Загрузить папку",
     "upload.uploading": "Загрузка...",
     "upload.complete": "{count} / {total} загружено",
+    "upload.files": "файлов",
     "rename": "Переименовать",
     "move": "Переместить в...",
     "move_to": "Переместить в",

static/locales/zh.json

@@ -27,6 +27,7 @@
     "upload_folder": "上传文件夹",
     "upload.uploading": "上传中...",
     "upload.complete": "{count} / {total} 已上传",
+    "upload.files": "文件",
     "rename": "重命名",
     "move": "移动到...",
     "move_to": "移动到",