Remove unsupported optional argument.

Thanks Jürgen for insisting. The \caption* command of long tables does indeed
not support optional arguments.
whitespace
Allow statusbar to be set on or off in full screen mode as a
preference.
Table cells are insets, but not from the point of view of DocIterators
and Cursors. So just calling InsetText::addToToc for the cells causes
problems, because InsetText::addToToc then adds the cell inset itself
as part of the DocIterator. This then leads to assertions, such as bug

The solution is to refactor InsetText::addToToc so that we can call the
iterating part without adding the inset.
Fix \caption* definition (see #8993)
de.po
* sk.po