Below is a step by step on how you can translate the video using the YouTube translate function option to do so.
*Please note that below is for the PC only, as for mobile devices this can vary on how you can use the subtitles setting of YouTube! In some cases, it is not possible to translate in your language since some devices are not supported, allow this option or is not available.
For mobile phone please use the following link of Googles Support page regarding the subject.
Click on the cc which is underlined here (right corner in the bottom)
Then click on the cogwheel next to it, which is marked red and then the following popup will show.
Click on English (auto-generated) (this could be different depending on your geographic location and/or preference setting) which will take you to step 3.
After you clicked the following screen will appear, here click on auto-translate!
tep 3 you will now see a list of many languages, please select the one that is best for you.