improving web text editor: added a preview panel, toolbar and unicode/latex symbol insertion panels 

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30355 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
properties files and related resources automatically updated from ggbtrans

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30356 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
improving web text editor: prevent key/mouse handling in TextPreviewPanel

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30357 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e