Just answering my own question :)

I solved it by passing an Ampscript variable, setting it up as a hidden field on form submit, and calling it during Post passing the subscriber's language to the data extension.

Something like this:

Sign-up page:

(Ampscript)

%%[ set @formlang = "en-CA" set @formlang = "fr-CA" ]%%

*(HTML) *

<input type="hidden" name="formlang" id="formlang" value="%%=v(@formlang)=%%"/>

Confirmation page - on POST

(Ampscript)

%%[ set @formlang = RequestParameter("formlang"); UpsertData ('lang', @formlang) ]%%

if you have an alternative to the above, share it here - thanks!

Just answering my own question :)

I solved it by passing an Ampscript variable, setting it up as a hidden field on form submit, and calling it during Post passing the subscriber's language to the data extension.

Something like this:

Sign-up page:

(Ampscript)

%%[
set @formlang = "en-CA" 
set @formlang = "fr-CA"
]%%

(HTML)

<input type="hidden" name="formlang" id="formlang" value="%%=v(@formlang)=%%"/>

Confirmation page - on POST

(Ampscript)

%%[
set @formlang = RequestParameter("formlang");   
UpsertData ('lang', @formlang)
]%%

if you have an alternative to the above, share it here - thanks!