Contacts+ dialer supports the following languages: English (including Latin languages), Russian, Greek, Hebrew, Arabic, Chinese and Turkish. To change your Contacts+ dialer language, go to the ' ≡ ' Menu button (to the top left corner of your app) > Select the ⚙ 'Settings' option from the list > Tap on 'Dialer & Calls' > Select the language of your choice from the pop-up list.
Here attached is the .gif file of the procedure (for reference):
