MAINT-5860: remove timestamp from the about box (version id is enough)

indra/newview/llappviewer.cpp

indra/newview/skins/default/xui/da/floater_about.xml

indra/newview/skins/default/xui/de/strings.xml

indra/newview/skins/default/xui/en/strings.xml

indra/newview/skins/default/xui/es/strings.xml

indra/newview/skins/default/xui/fr/strings.xml

indra/newview/skins/default/xui/it/strings.xml

indra/newview/skins/default/xui/ja/strings.xml

indra/newview/skins/default/xui/pt/strings.xml

indra/newview/skins/default/xui/ru/strings.xml

indra/newview/skins/default/xui/tr/strings.xml

indra/newview/skins/default/xui/zh/strings.xml