comment added

Author: yennie02

src/main/java/org/jabref/logic/msbib/MSBibMapping.java

@@ -25,6 +25,8 @@ public class MSBibMapping {
 
     private static final BiMap<Field, String> BIBLATEX_TO_MS_BIB = HashBiMap.create();
 
+
+    // https://learn.microsoft.com/en-us/openspecs/office_standards/ms-oe376/6c085406-a698-4e12-9d4d-c3b0ee3dbc4a
     private static final BiMap<String, Integer> LANG_TO_LCID = HashBiMap.create();
 
     static {