feat: parse language from NFO metadata source

server/scanner/NfoFileScanner.js

@@ -38,6 +38,10 @@ class NfoFileScanner {
               sequence: nfoMetadata.sequence || null
             }]
           }
+        } else if (key === 'language') {
+          if (nfoMetadata.language) {
+            bookMetadata.language = nfoMetadata.language
+          }
         } else if (nfoMetadata[key] && key !== 'sequence') {
           bookMetadata[key] = nfoMetadata[key]
         }

server/utils/parsers/parseNfoMetadata.js

@@ -81,6 +81,10 @@ function parseNfoMetadata(nfoText) {
         case 'isbn-13':
           metadata.isbn = value
           break
+        case 'language':
+        case 'lang':
+          metadata.language = value
+          break
       }
     }
   })