move and update createicons & check_glade scripts
Create new generate_pot.py script for translations

 * glade3 files require workaround with intltool-extract
 * webui javascript files are now included
 * fix multiline string for parse
Replace Markup with gtkbuilder atttributes for simpler translation labels
#2218 #2254 : Re-enable utpex control and add lt_tex (tracker exchange)