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_Arabia
2052 - Chinese_China
1028 - Chinese_Taiwan
1030 - Danish_Denmark
1043 - Dutch_Netherlands
1033 - English_United_States
1036 - French_France
1031 - German_Germany
1037 - Hebrew_Israel
1040 - Italian_Italy
1041 - Japanese_Japan
1042 - Korean_Korea_Republic
1046 - Portuguese_Brazil
1049 - Russian_Russian_Federation
1034 - Spanish_Spain
1053 - Swedish_Sweden