The Documentation tab is the largest of the Translation tabs as it has the most options. But they are relatively simple options, so should be quick to translate. The first tab, the "Titles and Fonts" has only two real items of text that may need translating. The fonts and font sizes are there to allow you to match any special fonts that you might need to the language you are translating.
The two fields that may need translating are marked below in red circles. Once you have translated them click the green translation status icon to show you are finished.