Fix: zu weite Deutsch-Erkennung konnte falsche Tonspur behalten

- isGermanStream: Titel-Fallback nur noch ganze Woerter (german/deutsch); die
  2-3-Buchstaben-Codes ger/deu sind im freien Titel-Text mehrdeutig und konnten
  die falsche Spur als "deutsch" picken (und damit die echte deutsche loeschen).
  Der Sprach-Tag-Check (ger/deu/de) bleibt unveraendert.
- looksLikeGermanRelease: 'dubbed' entfernt — ein nacktes "Dubbed" kann ein
  italienischer/franzoesischer Dub sein und darf den German-first-Fallback nicht
  ausloesen. Explizite german/deutsch-Tokens reichen.
- 2 Negativtests (3-Letter-Titel-Code, nicht-deutscher Dub).

src/main/video-processor.ts

@@ -89,10 +89,11 @@ export function isRemuxableVideoFile(fileName: string): boolean {
 // True when the release name explicitly marks it as a German release. Used in
 // tag mode to fall back to the first audio track (German-first scene convention)
 // when the audio language tags are wrong (a German dub mislabeled "eng"), instead
-// of skipping. Deliberately requires an explicit german/deutsch/dubbed token —
-// the ".DL." marker alone (present on every processed file) is not enough.
+// of skipping. Deliberately requires an explicit german/deutsch token — the
+// ".DL." marker alone (present on every processed file) is not enough, and a bare
+// "dubbed" can mean an Italian/French dub, so it must NOT flag a German release.
 export function looksLikeGermanRelease(fileName: string): boolean {
-  return /(^|[._\s-])(german|deutsch|dubbed)([._\s-]|$)/i.test(fileName);
+  return /(^|[._\s-])(german|deutsch)([._\s-]|$)/i.test(fileName);
 }
 
 function isGermanStream(stream: ProbedAudioStream): boolean {
@@ -100,8 +101,11 @@ function isGermanStream(stream: ProbedAudioStream): boolean {
   if (["ger", "deu", "de", "german", "deutsch"].includes(lang)) {
     return true;
   }
+  // Free-text title fallback (used when the language tag is missing). Full words
+  // only — the 2-3 letter codes ger/deu are too ambiguous in a title and would
+  // pick the wrong track to keep (which then deletes the real German one).
   const title = (stream.title || "").toLowerCase();
-  return /\b(german|deutsch|ger|deu)\b/.test(title);
+  return /\b(german|deutsch)\b/.test(title);
 }
 
 // Decide which audio track to keep. Safety invariant: only ever choose to remux

tests/video-processor.test.ts

@@ -85,6 +85,13 @@ describe("pickAudioTrack", () => {
     expect(d).toMatchObject({ action: "remux", audioRelIndex: 1 });
   });
 
+  it("tag mode does NOT treat an ambiguous 3-letter title code as German (no false-positive pick)", () => {
+    // Two untagged tracks whose titles are only "Ger"/"Deu" must not be mistaken
+    // for a German track; with no real German signal this falls back to first.
+    const d = pickAudioTrack([{ language: "", title: "Ger" }, { language: "", title: "Deu" }], "tag");
+    expect(d).toMatchObject({ action: "remux", audioRelIndex: 0, reason: "fallback-first-untagged" });
+  });
+
   it("tag mode with single German -> single (no remux)", () => {
     expect(pickAudioTrack([ger], "tag")).toMatchObject({ action: "single" });
   });
@@ -125,6 +132,10 @@ describe("looksLikeGermanRelease", () => {
     expect(looksLikeGermanRelease("Show.S01E01.DL.720p.x264.mkv")).toBe(false);
     expect(looksLikeGermanRelease("Show.S01E01.MULTi.1080p.mkv")).toBe(false);
   });
+  it("does not flag a non-German dub as a German release (bare 'Dubbed' is ambiguous)", () => {
+    expect(looksLikeGermanRelease("Movie.2020.ITALIAN.Dubbed.DL.1080p.mkv")).toBe(false);
+    expect(looksLikeGermanRelease("Movie.2020.FRENCH.DUBBED.DL.720p.mkv")).toBe(false);
+  });
 });
 
 describe("parseFfprobeAudioStreams", () => {