How to switch the language on Kdenlive 0.8.2.1 ?

Hello, I am sorry to ask this basic quesion, but I have been search for this forum for a while and found nothing, so I have to ask your help. The quesion is simple: How to switch the language on Kdenlive 0.8.2.1 ?

It was in the menu bar-> About, but now it just gone to nowhere. Is anyone can help me with this quesion? Thank you!!