One of the last beta patches messed up the names of some Bf 109 versions, if steam is set to German language. The names are correct in the last offical version 1.05.
Bugtracker issue #430
See the comparison table and screenshots below:
Code:
English: German:
Bf 109 E-3 B Bf 109 E-3/b
Bf 109 E-4 Bf 109 E-4/b
Bf 109 E-4 B Bf 109 E-4 B