MAINT-6236 clean up unused version values in localized strings

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

indra/newview/skins/default/xui/de/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/pl/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