@romanbritons
I’m so sorry for outright ignoring this. I don’t really have any great excuse. We do our best to never ignore support requests and we really dropped the ball on this one. My apologies.
In any event there’s 2 ways to modify the language on this placeholder.
The non technical way: Since LifterLMS is fully translatable you can use an English -> UK English translation file to translate the placeholder like any other string. You can upload a translation file by following our translation guide: https://lifterlms.com/docs/how-to-load-lifterlms-translation-files-or-language-packs/
Or you could use Loco Translate: https://lifterlms.com/docs/how-do-i-customize-the-text-of-lifterlms-buttons-and-more/
If you’re technically inclined and know your way around PHP and WordPress hooks you could customize this with a filter: https://lifterlms.com/docs/add-custom-fields-lifterlms-checkout-open-registration/
That doc shows how to add custom registration fields but you could use the same filter lifterlms_get_person_fields to loop through the fields, get the phone field (look for it by the field ID) and then modify the placeholder property.
This second option is a little bit more complicated but if you know your way around PHP it’s actually probably easier.
Hope that helps,
