Youtube: Enable subtitles and choose the language

Automatically Translation from German:

Many videos on YouTube are subtitled in various languages​​. To switch these subtitles and select the desired language does one proceed as follows:
If the subtitles are stored in a video, circled symbol appears. This one turns on the function.

If show a red underscore below the first icon. Then are the subtitles active.

Now click on the setting symbol and choose the language.

It appears lower selection box.

Choose a language by the „subtitles“