update: reworked update menu

-moved software_update.cpp/h to update_menue.cpp/h
-add new class CUpdateSettings into files update_settings.cpp/h
-using update settings in sub menus, so we've got only hotkeys
 and less menu items in update menu
-reworked some locales

src/system/locals.h

@@ -502,6 +502,7 @@ typedef enum
 	LOCALE_FLASHUPDATE_REALLYFLASHMTD,
 	LOCALE_FLASHUPDATE_SAVESUCCESS,
 	LOCALE_FLASHUPDATE_SELECTIMAGE,
+	LOCALE_FLASHUPDATE_SETTINGS,
 	LOCALE_FLASHUPDATE_SQUASHFS_NOVERSION,
 	LOCALE_FLASHUPDATE_TITLEREADFLASH,
 	LOCALE_FLASHUPDATE_TITLEWRITEFLASH,