For subtitles in your language, turn on YouTube captions. Select the settings icon at the bottom of the video player, then select "Subtitles/CC" and choose your language.
Optimization score estimates how well your Google Ads account is set up to perform. Optimization score runs from 0-100%, with 100% meaning that your account may perform at its full potential. Learn more about optimization score.
Optimization scores for accounts and campaigns will be listed in the edit panel next to your customer ID. You can select multiple accounts or campaigns to see a combined optimization score in the Edit panel.