feat: add language support for better filtering

lexicons/space/remanso/note.json

@@ -19,6 +19,63 @@
             "description": "Markdown content. Local image paths are replaced with blob CIDs at publish time.",
             "maxLength": 10000
           },
+          "language": {
+            "type": "string",
+            "description": "Most used language in the note",
+            "maxLength": 10,
+            "knownValues": [
+              "afr",
+              "ara",
+              "aze",
+              "bel",
+              "ben",
+              "bul",
+              "cat",
+              "ces",
+              "ckb",
+              "cmn",
+              "dan",
+              "deu",
+              "ell",
+              "eng",
+              "est",
+              "eus",
+              "fin",
+              "fra",
+              "hau",
+              "heb",
+              "hin",
+              "hrv",
+              "hun",
+              "hye",
+              "ind",
+              "isl",
+              "ita",
+              "jpn",
+              "kat",
+              "kaz",
+              "kor",
+              "lit",
+              "mar",
+              "mkd",
+              "nld",
+              "nob",
+              "pes",
+              "pol",
+              "por",
+              "ron",
+              "run",
+              "rus",
+              "slk",
+              "spa",
+              "srp",
+              "swe",
+              "tgl",
+              "tur",
+              "ukr",
+              "vie"
+            ]
+          },
           "images": {
             "type": "array",
             "description": "Blob references for images embedded in the markdown content.",