I first referenced WDS version 2.6.0 in Windows Desktop Search version 2.6 is enabled for the enterprise.

The MUI for WDS 2.6.5 has 30 languages:

Brazilian Portuguese  
Bulgarian  
Chinese Simplified  
Chinese Traditional  
Croatian  
Czech  
Danish  
Dutch  
Estonian  
Finnish  
French  
German  
Greek  
Hungarian  
Italian  
Japanese  
Korean  
Latvian  
Lithuanian  
Norwegian  
Polish  
Portuguese  
Romanian  
Russian  
Spanish  
Slovak  
Slovenian  
Swedish  
Thai  
Turkish
You must first download and install the English version of WDS 2.6.5 before you can install the MUI.

NOTE: See Windows Desktop Search 2.6.5 – enabled for the enterprise.

Download the Multilingual User Interface Pack for Windows Desktop Search 2.6.5.