Align the labels on the tabs so that when you read them, your head is tilted
towards the content, instead of away.
When tabs are drawn to the right of panels in the sidebar, the labels are read
from bottom to top, which may suggest that this tab does not belong to the area.
This change does it like this:
Sidebar on the right: the text is read from top to bottom.
Sidebar on the left: the text keeps reading from bottom to top.
Guillermo Venegas