i18n: translate the download progress stage strings

Fill in the 4 `modals.download.progress.*` keys added by the previous
commit across all 9 locales, so no `[TODO: Translate]` placeholder remains
and the "no remaining placeholders" claim in the guidelines holds again.

No new terminology: `metadata` reuses the §5 row (fr métadonnées, de
Metadaten, es metadatos, ru метаданные, he מטא-נתונים, ja メタデータ,
ko 메타데이터, zh-CN 元数据, zh-TW 中繼資料) and the fetching phrasing
mirrors each locale's existing `download.fetchingRepoFiles` /
`fetchingVersions` (de passive "werden abgerufen", es "Obteniendo", fr
"Récupération des", ru "Получение", he "מביא", ja "取得中", ko "가져오는
중"). "model file" follows `errors.noModelFiles` in each file.

`{name}` and `{source}` are verbatim §1-R2 placeholders. `{source}` is
replaced at runtime with the *untranslated* platform name, so its
surrounding spacing follows each locale's `modelCard.actions.viewOnSource`
precedent — ja `{source} から`, ko `{source}에서`, zh `从 {source}` /
`從 {source}`, he `מ-{source}` (as in the existing `מ-CivitAI`), ru
`из {source}` (as in `из Workflow`) — and no brand ever appears inside the
translated text.

Punctuation: ASCII `:` for the Latin / Cyrillic / Hebrew locales and for
ja / ko, whose four sibling keys in the same `progress` block already use
ASCII; French keeps this file's ` : `; zh-CN / zh-TW use full-width `：`
like their siblings.

The guidelines gain a status block recording the pass and those spacing
precedents, so a future source added to the same slot does not have to
re-derive them.

Verified: `pytest tests/i18n/test_i18n.py` 20 passed,
`sync_translation_keys.py --dry-run` reports no drift, `npm test` exits 0
(1259 JS + 91 Vue). Each locale file gains exactly 4 lines — the values
were substituted as literals rather than re-serialising the JSON, so no
formatting churn.

locales/de.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "Aktuelle Datei:",
                 "downloading": "Wird heruntergeladen: {name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "Metadaten: {name}",
+                "indexingFile": "Modelldatei wird gelesen...",
+                "fetchingSourceMetadata": "Metadaten werden von {source} abgerufen...",
+                "fetchingMetadata": "Metadaten werden abgerufen...",
                 "transferred": "Heruntergeladen: {downloaded} / {total}",
                 "transferredSimple": "Heruntergeladen: {downloaded}",
                 "transferredUnknown": "Heruntergeladen: --",

locales/es.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "Archivo actual:",
                 "downloading": "Descargando: {name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "Metadatos: {name}",
+                "indexingFile": "Leyendo el archivo de modelo...",
+                "fetchingSourceMetadata": "Obteniendo metadatos de {source}...",
+                "fetchingMetadata": "Obteniendo metadatos...",
                 "transferred": "Descargado: {downloaded} / {total}",
                 "transferredSimple": "Descargado: {downloaded}",
                 "transferredUnknown": "Descargado: --",

locales/fr.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "Fichier actuel :",
                 "downloading": "Téléchargement : {name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "Métadonnées : {name}",
+                "indexingFile": "Lecture du fichier de modèle...",
+                "fetchingSourceMetadata": "Récupération des métadonnées depuis {source}...",
+                "fetchingMetadata": "Récupération des métadonnées...",
                 "transferred": "Téléchargé : {downloaded} / {total}",
                 "transferredSimple": "Téléchargé : {downloaded}",
                 "transferredUnknown": "Téléchargé : --",

locales/he.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "הקובץ הנוכחי:",
                 "downloading": "מוריד: {name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "מטא-נתונים: {name}",
+                "indexingFile": "קורא קובץ מודל...",
+                "fetchingSourceMetadata": "מביא מטא-נתונים מ-{source}...",
+                "fetchingMetadata": "מביא מטא-נתונים...",
                 "transferred": "הורד: {downloaded} / {total}",
                 "transferredSimple": "הורד: {downloaded}",
                 "transferredUnknown": "הורד: --",

locales/ja.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "現在のファイル:",
                 "downloading": "ダウンロード中: {name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "メタデータ: {name}",
+                "indexingFile": "モデルファイルを読み込み中...",
+                "fetchingSourceMetadata": "{source} からメタデータを取得中...",
+                "fetchingMetadata": "メタデータを取得中...",
                 "transferred": "ダウンロード済み: {downloaded} / {total}",
                 "transferredSimple": "ダウンロード済み: {downloaded}",
                 "transferredUnknown": "ダウンロード済み: --",

locales/ko.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "현재 파일:",
                 "downloading": "다운로드 중: {name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "메타데이터: {name}",
+                "indexingFile": "모델 파일 읽는 중...",
+                "fetchingSourceMetadata": "{source}에서 메타데이터 가져오는 중...",
+                "fetchingMetadata": "메타데이터 가져오는 중...",
                 "transferred": "다운로드됨: {downloaded} / {total}",
                 "transferredSimple": "다운로드됨: {downloaded}",
                 "transferredUnknown": "다운로드됨: --",

locales/ru.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "Текущий файл:",
                 "downloading": "Скачивается: {name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "Метаданные: {name}",
+                "indexingFile": "Чтение файла модели...",
+                "fetchingSourceMetadata": "Получение метаданных из {source}...",
+                "fetchingMetadata": "Получение метаданных...",
                 "transferred": "Скачано: {downloaded} / {total}",
                 "transferredSimple": "Скачано: {downloaded}",
                 "transferredUnknown": "Скачано: --",

locales/zh-CN.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "当前文件：",
                 "downloading": "下载中：{name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "元数据：{name}",
+                "indexingFile": "正在读取模型文件...",
+                "fetchingSourceMetadata": "正在从 {source} 获取元数据...",
+                "fetchingMetadata": "正在获取元数据...",
                 "transferred": "已下载：{downloaded} / {total}",
                 "transferredSimple": "已下载：{downloaded}",
                 "transferredUnknown": "已下载：--",

locales/zh-TW.json

@@ -1488,10 +1488,10 @@
             "progress": {
                 "currentFile": "目前檔案：",
                 "downloading": "下載中：{name}",
-                "metadata": "[TODO: Translate] Metadata: {name}",
-                "indexingFile": "[TODO: Translate] Reading model file...",
-                "fetchingSourceMetadata": "[TODO: Translate] Fetching metadata from {source}...",
-                "fetchingMetadata": "[TODO: Translate] Fetching metadata...",
+                "metadata": "中繼資料：{name}",
+                "indexingFile": "正在讀取模型檔案...",
+                "fetchingSourceMetadata": "正在從 {source} 取得中繼資料...",
+                "fetchingMetadata": "正在取得中繼資料...",
                 "transferred": "已下載：{downloaded} / {total}",
                 "transferredSimple": "已下載：{downloaded}",
                 "transferredUnknown": "已下載：--",