Hi Rahul,
You are using a dropdown that is using an entity attribute. Mendix does not have entity attributes that can hold different values for different languages.
If there is a way to use enumeration values, use those. Enumerations do have different captions for different languages.
A possible workaround could be using multiple attributes in the entity like 'AttributeEnglish’ and ‘AttributeSpanish’. Then use multiple dropdowns with the different attributes. Based on the language of the user you can show the correct dropdown.
Hope this helps!