cannot find a phrase to translate

Hi.
I cannot find the "Registration Start Date" using the translation management to translate it to Spanish,

In the [Translation Manager], enter the word "start" into the [Filter] box, and you should see [EB_REGISTRATION_START_DATE].
I've found that using the [Filter] box is the best way to search in the Translation Manager as there are currently 11 pages of Keys/Translations!!

you are right, found it.
But now I realize that in the individual registration, almost all the definitions of the text boxes are in english, and they don't change even when I modify them... city, first name, last name.... I have translated other parts without problems...

For the title of custom fields in Registration Form, please go to Events Booking -> Custom Fields, click on the custom field to edit and change the title from there

After that, it will work well

Regards,

Tuan