If you want to translate custom fields values in DJ-Classifieds follow this few simple steps. We will make an example translation to show how the process looks like.

Go to DJ-Classifieds and open "Options".

Go to the "Custom fields values to labels" option and set it as "Yes".

Now open the "Fields" in DJ-Classifieds control panel.

Open the field where you want to translate the values. We've created the custom "Color" field.

We've defined five color values for this field.

They are also visible at the frontpage. 

Now you can translate them using Language Overrides. More information you can find here.

Let's make an example translation for COM_DJCLASSIFIEDS_YELLOW color.

Go to Extensions -> Languages.

Open the "Overrides".

Click "New" and create a new override.

Set the language constant of the string you want to override and then enter the text you want to display instead of the original one. Click "Save & Close".

 The result is visible at the list of overrides:

 And on the frontpage:

Values are also visible at the search box (We've have translated all values already)

And at the ad details ("red" color was added for this ad):

 We've used the english language for our translation, but there are more languages available. Each language need to be installed first.

Installed language you can choose from Filter option.

When creating a new override, you will see that chosen language is automatically added to the "Language" option. 

Result is visible here: