Install a language locale by associating the locale .mst file to the TRANSFORMS parameter. For example, to install the French (France) locale:

msiexec /i CiscoIPCommunicatorSetup.msi /qb+ TRANSFORMS="1036.mst" Language code-----------------1025 - Arabic_Saudi_Arabia2052 - Chinese_China1028 - Chinese_Taiwan1030 - Danish_Denmark1043 - Dutch_Netherlands1033 - English_United_States1036 - French_France1031 - German_Germany1037 - Hebrew_Israel1040 - Italian_Italy1041 - Japanese_Japan1042 - Korean_Korea_Republic1046 - Portuguese_Brazil1049 - Russian_Russian_Federation1034 - Spanish_Spain1053 - Swedish_Sweden