Some button and label added for navigation bar. (#3246)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25258 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
stylingBar (fixes)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25259 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Mistake in last commit fixed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25260 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Use HTML-improvement for label measuring

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25261 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
New splash design test.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25262 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e