Lazy loading of subtoolbars

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29271 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3631: Attempt to fix wrong character problem on OSX in sign-in menu

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29273 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Try to fix applets

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29274 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3691: BackgroundImageModelin 'Basic' tab of Object Properties for web


git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29275 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e