- How can I translate the "Day", "Month" and "Year" string(My Account-Customer Info-Date of Birth) to other language?
You can not able to translate these values because the view of this control (datetime picker for the date of birth) is an extension method now and it doesn't contain localization support now.
It would be better to update those codes to use somehow the available localization support. I don't know who is responsible for this change but the following thing may can help the developers:
The missing feature: Localization for the first option element of the select input HTML tag generation.
The code where localization can be added (you can find that somewhere near the bolded text):
Nop.Web.Framework.HtmlExtensions.DatePickerDropDowns(....)
line 215 days.AppendFormat("<option value='{0}'>{1}</option>", "0", "Day");