fix(plex): the recs rail's anchor and a held recommendation are named in the reader's language (E30 S1b)

Found in the S1b UAT: 'Mert megnézted: Batman Forever' kept the English title, and
the info page's TMDB recommendations kept TMDB's English titles even for titles we
hold. A held recommendation is now named as the library names it, in the reader's
language; one we lack keeps TMDB's title.

backend/app/routes/plex/detail.py

@@ -211,7 +211,7 @@ def show_detail(
             "episode_count": show_roll["episode_count"],
             "collection_keys": sh.collection_keys or [],
             # TMDB enrichment (E5 S2), served from the row.
-            "tmdb": plex_tmdb.serve_block(db, sh),
+            "tmdb": plex_tmdb.serve_block(db, sh, lang=lang),
         },
         "seasons": [_season_block(se, by_season.get(se.id, [])) for se in seasons],
         "related": related,
@@ -517,5 +517,5 @@ def item_detail(
         "next_id": next_id,
         "collections": _collection_strips(db, it, user.id, lang),
         # TMDB enrichment (E5 S2), served from the row — movies only (episodes aren't enriched).
-        "tmdb": plex_tmdb.serve_block(db, it) if it.kind == "movie" else None,
+        "tmdb": plex_tmdb.serve_block(db, it, lang=lang) if it.kind == "movie" else None,
     }

backend/app/routes/plex/discover.py

@@ -313,7 +313,7 @@ def _because_you_watched(
     )
     if anchor is None:
         return None
-    resolved = resolve_recs(db, anchor.recommendations)
+    resolved = resolve_recs(db, anchor.recommendations, lang=lang)
     # Preserve TMDB's recommendation order, keep only in-library hits, and drop the anchor itself.
     rks = [
         r["rating_key"]
@@ -362,7 +362,10 @@ def _because_you_watched(
             items.append(scards[rk])
     if not items:
         return None
-    return {"anchor": {"id": anchor.rating_key, "title": anchor.title}, "items": items}
+    return {
+        "anchor": {"id": anchor.rating_key, "title": display_title(anchor, lang)},
+        "items": items,
+    }
 
 
 @router.get("/discover")