diff --git a/src/lang/czech.txt b/src/lang/czech.txt
--- a/src/lang/czech.txt
+++ b/src/lang/czech.txt
@@ -34,10 +34,15 @@ STR_CARGO_PLURAL_PASSENGERS.gen                                 :Cestujících
 STR_CARGO_PLURAL_PASSENGERS.big                                 :Cestující
 STR_CARGO_PLURAL_COAL                                           :Uhlí
 STR_CARGO_PLURAL_COAL.big                                       :Uhlí
-STR_CARGO_PLURAL_MAIL                                           :Pošta
-STR_CARGO_PLURAL_MAIL.gen                                       :Pošty
-STR_CARGO_PLURAL_MAIL.acc                                       :Poštu
+STR_CARGO_PLURAL_MAIL                                           :{G=f}Pošta
+STR_CARGO_PLURAL_MAIL.nom                                       :{G=f}pošta
+STR_CARGO_PLURAL_MAIL.gen                                       :{G=f}pošty
+STR_CARGO_PLURAL_MAIL.dat                                       :{G=f}poštu
+STR_CARGO_PLURAL_MAIL.acc                                       :{G=f}poštu
+STR_CARGO_PLURAL_MAIL.loc                                       :{G=f}poště
+STR_CARGO_PLURAL_MAIL.ins                                       :{G=f}poštou
 STR_CARGO_PLURAL_MAIL.big                                       :Pošta
+STR_CARGO_PLURAL_MAIL.small                                     :{G=f}pošta
 STR_CARGO_PLURAL_OIL                                            :Ropa
 STR_CARGO_PLURAL_OIL.gen                                        :Ropy
 STR_CARGO_PLURAL_OIL.acc                                        :Ropu