Style iteration of signindialog

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24545 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Typo

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24546 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Save files as .ggb

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24547 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e