Ok this is now in svn:
- modders can now override land and air field names using lng specific files for a tileset (follows same principle as techtree lng files). Currently supported translatable strings:
FieldLandName=Land
FieldAirName=Air
If you don't want it per tileset, do not create any lng files in the tileset lang folder. You may optionally create two entries in the normal lng file:
FieldLand=Land
FieldAir=Air
However this would affect all games played using the normal lng files.